I parassiti vegetali delle piante coltivate od utili - Ferraris, Teodoro. (Sineo & Bo, 1913)

Part I. The living flora of West Virginia - Millspaugh, Charles Frederick, 1854 -1923 (Wheeling news litho. co, 1913)

A pathological survey of the Para rubber tree (Hevea brasiliensis) in the Amazon Valley - Weir, James R. (James Robert), 1882 -1943 (U.S. Dept. of Agriculture, 1926)

Patologia vegetale. Fanerogame parassite, mixomiceti, bacterii, ifomiceti od eumiceti (funghi) - Voglino, Pietro. (Unione tipografico-editrice [Gia ditta Pomba e c], 1905)

Peach leaf curl : its nature and treatment - Pierce, Newton Barris, 1856 -1916 (Government Printing Office, 1900)

Peach yellows : a preliminary report - Smith, Erwin F. (Erwin Frink), 1854 -1927 (Dept. of Agriculture, Botanical Division, 1888)

The peaches of New York - New York (State). Dept. of Agriculture. (J.B. Lyon Company, printers, 1917)

The Peanut, the unpredictable legume; a symposium - Arant, F. S. (Frank Selman), 1904 - (National Fertilizer Association, 1912)

The pecan and its culture - Hume, H. Harold (Hardrada Harold), 1875 -1965 (The author, 1910)

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