The origin of a land flora, a theory based upon the facts of alternation - Bower, F. O. (Frederick Orpen), 1855 -1948 (Macmillan and Co., Ltd, 1908)

The origin of a land flora : a theory based upon the facts of alternation - Bower, F. O. (Frederick Orpen), 1855 -1948 (Macmillan, 1908)

O.S.U. naturalist - Ohio State University. Biological Club. (Biological Club of Ohio State University, 1900)

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

Our native ferns and their allies : with synoptical descriptions of the American Pteridophyta north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (Leader Pub. Co, 1881)

Our native ferns and their allies : with synoptical descriptions of the American Pteridophyta north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (H. Holt, 1896)

Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (H. Holt and company, 1888)

Our native ferns and their allies; with synoptical descriptions of the American "Pteridophyta" north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (Holt, 1888)

Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (H. Holt, 1900)

Our native ferns and their allies; with synoptical descriptions of the American Pteridophyta north of Mexico - Underwood, Lucien Marcus, 1853 -1907 (H.Holt, 1900)

Outlines of classification and special morphology of plants - Balfour, Isaac Bayley, 1853 -1922 (Clarendon Press, 1887)

Outlines of classification and special morphology of plants - Goebel, K. (Karl), 1855 -1932 (Clarendon Press, 1887)

Outlines of the history of botany - Harvey-Gibson, R. J. (Robert John), 1860 -1929 (Black, 1919)

Outlines of the history of botany - Harvey-Gibson, R. J. (Robert John), 1860 -1929 (A.& C. Black, 1919)

Pacific science - University of Hawaii. (University Press of Hawaii, 1947)

Pacific silver fir : a bibliography with abstracts - Williams, Carroll B. (Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1965)

Die palaeobotanische Literatur : bibliographische Übersicht über die Arbeiten aus dem Gebiete der Palaeobotanik - Jongmans, W. (Willem), 1878 -1957 (Fischer, 1913)

Palaeontology - Palaeontological Association (Palaeontological Association, 1993)

Paleobotany and biogeography : a festschrift for Alan Graham in his 80th year - Raven, Peter H (Missouri Botanical Garden, 2014)

Paleobotany, paleoecology, and evolution - Niklas, Karl J (Praeger, 1900)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1884)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1886)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1892)

Pamietnik Fizyjograficzny (Druk K. Kowalewskiego, 1918)

Papers on botany - Stout, A.B. (Arlow Burdette ) 1876 -1957 (1921)