Books by Richard C. McGregor:
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McGregor, Richard C. (Richard Crittenden), 1871-1936: A List of the Land Birds of Santa Cruz County, California (1901) (PDF at unm.edu)
Additional books by Richard C. McGregor in the extended shelves:
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McGregor, Richard C. (Richard Crittenden), 1871-1936: Birds from Benguet Province, Luzon, and from the islands of Lubang, Mindoro, Cuyo, and Cagayancillo (Bureau of Public Printing, 1904) (page images at HathiTrust)- McGregor, Richard C. (Richard Crittenden), 1871-1936: The birds of Calayan and Fuga, Babuyan group. (Bureau of public printing, 1904) (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: Distribution of life in the Philippines. (Bureau of printing, 1928), also by Roy E. Dickerson, Albert W. Herre, Edward Harrison Taylor, Willie Schultze, and Elmer D. Merrill (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: A hand-list of the birds of the Philippine Islands. (Bureau of printing, 1906), also by Dean C. Worcester (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: I. Birds from the islands of Romblon. Sibuyan, and Cresta de Gallo. : II. Further notes on birds from Ticao, Cuyo, Culion, Calayan, Lubang, and Luzon (Bureau of public printing, 1905) (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: Index to the genera of birds (Bureau of Printing, 1920) (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: A list of the land birds of Santa Cruz County, California. (The Club, 1901) (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: A Manual of Philippine Birds (Gutenberg ebook)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: Notes on three rare Luzon birds (Bureau of Public Printing, 1905) (page images at HathiTrust)
- McGregor, Richard C. (Richard Crittenden), 1871-1936: Notes on three rare Luzon birds (Bureau of Public Printing, 1905) (page images at HathiTrust)
Find more by Richard C. McGregor at your library, or elsewhere.