Occasional papers - San Diego Society of Natural History. (San Diego Society of Natural History, 1949)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1973)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 1979)

Occasional papers of the California Academy of Sciences - California Academy of Sciences (California Academy of Sciences, 2010)

Occurrence of shrubs and herbaceous vegetation after clear cutting old-growth Douglas-fir in the Oregon Cascades - Pacific Northwest Forest; Range Experiment Station (Portland, Or.) (Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1960)

Oesterreichische botanische Zeitschrift (A. Skofitz, 1900)

Oesterreichisches botanisches Wochenblatt ([L.W. Seidel], 1854)

The Ohio journal of science - Ohio Academy of Science. (Ohio Academy of Science, 1920)

Olds' catalog : farm and garden seeds : 1925, 38th year - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (L.L. Olds Seed Company, 1925)

"On gardening" - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (1937)

"On gardening" - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (1938)

Orchard and farm (Calkins Newspaper Syndicate, 1922)

Orchard and garden - Douglass, Benjamin Wallace 1882 -1939 (Federal publishing company, 1918)

Orchard and garden (J.T. Lovett, 1889)

Orchard Hill Nursery : spring 1927 [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orchard Hill Nursery, 1927)

Orchard Hill Nursery : spring 1928 [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Orchard Hill Nursery, 1928)

Oregon flora newsletter - Oregon State University. Department of Botany; Plant Pathology. (Oregon Flora Project, Dept. of Botany & Plant Pathology, Oregon State University, 1999)

Oregon flora newsletter - Oregon State University. Department of Botany; Plant Pathology. (Oregon Flora Project, Dept. of Botany & Plant Pathology, Oregon State University, 2004)

Oregon flora newsletter - Oregon State University. Department of Botany; Plant Pathology. (Oregon Flora Project, Dept. of Botany & Plant Pathology, Oregon State University, 2010)

Oregon wild flowers - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Clarice Nye, 1931)

Oregon wild flowers, rock plants and seeds, lilies, trees and shrubs, ferns, perennials - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Mrs. Clarice Nye, 1932)

Florist's journal (How and Parsons, 1840)

Florist's journal (How and Parsons, 1842)

Florist's journal (How and Parsons, 1844)

Florist's journal (How and Parsons, 1846)

Florist's journal (How and Parsons, 1847)

Florist's journal (How and Parsons, 1848)

Ornamental nursery stock - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jewell Nursery Co, 1916)

Ornamental nursery stock - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jewell Nursery Co, 1908)

Ornamental plants for the home grounds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Shumaker's Birchmont Gardens, 1936)

Ornamental trees, shrubs, roses, bedding plants : catalog number fifteen - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (East Lawn Nursery, 1930)

Ornamentals, fruit trees, roses : 1922-1923 - Roeding, George Christian, 1868 -1928 (California Nursery Co, 1922)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1909)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1910)

The Ottawa naturalist - Ottawa Field-Naturalists' Club (Ottawa Field-Naturalists' Club, 1915)

Our 50th anniversary - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (D. Rusconi Seed Store, 1932)

Our annual catalog of "pure & sure" seeds - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (St. Louis Seed Co, 1907)

Our annual message : 1908 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (St. Louis Seed Co, 1908)

Our garden flowers; a popular study of their native lands, their life histories, and their structural affiliations - Keeler, Harriet L. (Harriet Louise), 1846 -1921 (C. Scribner's Sons, 1910)

Our new guide to rose culture - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1892)

Our new guide to rose culture : 1891 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1891)

Our new guide to rose culture : 1894 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (The Dingee & Conard Co, 1892)

P.-W.'s 1931 wholesale price list : seeds bulbs shrubs roses trees garden and poultry supplies - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Porter-Walton Co, 1931)

Pacific Northwest Rivers Study : final report, Montana - Decker-Hess, Janet. ([Montana Dept. of Fish, Wildlife, and Parks, 1988)

Pacific rural handbook; containing a series of brief and practical essays and notes on the culture of trees, vegetables and flowers, adapted to the Pacific coast. Also hints on home and farm improvements - Shinn, Charles Howard, 1852 -1924 (Dewey & co, 1879)

Pakro annual : a guide to better gardens - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (American Seed and Seedtape Company, 1922)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1947)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1956)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1962)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1965)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1966)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1969)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1972)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1974)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1976)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1977)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1989)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1995)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 1997)

The Pan-Pacific entomologist - Van Duzee, Edward P. (Edward Payson), 1861 -1940 (Pacific Coast Entomological Society, 2001)

Papilio - Edwards, Henry, 1827 -1891 (New York Entomological Club, 1884)

The parade of modern roses and perennials : spring 1952 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jackson and Perkins Company, 1952)

The parade of modern roses and perennials : spring 1953 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Jackson and Perkins Company, 1953)

Park's illustrated flower book of choice dependable seeds, season of 1936 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Geo. W. Park Seed Company, 1936)

Paxton's magazine of botany, and register of flowering plants - Paxton, Joseph, Sir, 1803 -1865 (Orr and Smith [etc.], 1838)

Pearce seed company : rare plant nursery, offer no. 69, 1958 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pearce Seed Company, 1958)

Peonies, hardy garden perennials, ornamental evergreens, shade trees and shrubs : 1931 issue superseding all previous issues - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Thurlow's and Stranger, Inc, 1931)

Peonies, hardy garden perennials, ornamental evergreens, shade trees and shrubs : 1930 issue superseding all previous issues - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Thurlows & Stranger, Inc, 1930)

Perennial plants [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Joseph F. Martin Perennial Nurseries, 1930)

Perennial plants for the florist, the landscaper, the garden, the border, the rockery - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Joseph F. Martin Co, 1935)

Perennial plants, spring and fall bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (D.H. Snowberger, 1930)

Perennial plants : wholesale only - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Joseph F. Martin Perennial Nurseries, 1934)

Perennials, alpines and rock plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Cowgill & Rogers, 1929)

Perennials and rock plants : 1947 wholesale price list - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Sunny Border, Incorporated, 1947)

Perennials in your garden - Canada. Agriculture Canada (Agriculture Canada, 1983)

Perennials, or, Old fashioned hardy garden flowers [catalog] - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Pontiac Nurseries, 1924)

Perennials, rock plants, cut flowers, seedling annuals, bulbs - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hildemere Gardens, 1936)

Periodical catalogue of fruit and ornamental trees and plants : 1845 & 1846 - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Joseph H. Jennings, Printer, 1845)

Periodical catalogue of fruit and ornamental trees and plants - Henry G. Gilbert Nursery; Seed Trade Catalog Collection. (Hopkins & Jennings, Printers, 1843)

Pesticides documentation bulletin - National Agricultural Library (U.S.) (National Agricultural Library, U.S. Dept. of Agriculture, #c 1965-1969, 1965)

Phenology and production studies on semi-arid shrub types : annual progress report : 1981 results - United States. Bureau of Land Management. (Wyoming Agricultural Experiment Station, 1982)

Philadelphia flower & garden show - Pennsylvania Horticultural Society. (The Society, 1976)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1968)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1969)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1970)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1986)

Philadelphia flower show - Pennsylvania Horticultural Society. (The Society, 1990)

Philosophical notes on botanical subjects - Bonavia, E. (Emanuel), 1829 -1908 (Eyre and Spottiswoode, 1892)

PHS news - Pennsylvania Horticultural Society. (The Society, 1995)

Phyto-edaphic communities of the Upper Rio Puerco Watershed, New Mexico - Francis, Richard E. (U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, 1986)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1967)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1972)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1971)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1976)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1977)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1979)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1980)