Letters received by Greene (1871-1915), and copies of Greene's correspondence (1904-1909); notebooks containing descriptions of plant species; clippings and scrapbooks; notebooks containing records of letters sent by Greene (1881-1915); an account book (1830s) and financial records; report of the Botany Department, Catholic University of America (1902); card file of books in Greene's library; botanical and autobiographical articles and manuscripts by Greene; and photographs.

Greene's letters to Julius A. Nieuwland, CSC, 1905-1915, may be found in box 10 of the Nieuwland Papers and in our digital edition of Nieuwland's correspondence. The Nieuwland Papers also include a folder containing photostats of Greene's leaflets (box 9 folder 11).

The Robert P. McIntosh Collection in our archives contains a card file (CMSH box 2) that serves as a supplementary finding aid for Greene's letter books (in boxes 10 and 11 below).

Microfilm of Greene papers was made and sent to the University of Oregon Library in November, 1965.