Books by Asa A. Schaeffer:
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Schaeffer, Asa A. (Asa Arthur), 1883-: Taxonomy of the Amebas, With Descriptions of Thirty-Nine New Marine and Freshwater Species (Papers from the Dept. of Marine Biology v24; Carnegie Institution of Washington publication #345; 1926) (page images at HathiTrust)
Additional books by Asa A. Schaeffer in the extended shelves:
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Schaeffer, Asa A. (Asa Arthur), 1883-: Ameboid movement (Princeton University Press, 1920) (page images at HathiTrust)- Schaeffer, Asa A. (Asa Arthur), 1883-: Ameboid movement (Gutenberg ebook)
- Schaeffer, Asa A. (Asa Arthur), 1883-: Selection of food in Stentor caeruleus (Ehr.) ... ([Baltimore], 1909) (page images at HathiTrust)
Find more by Asa A. Schaeffer at your library, or elsewhere.