“A Revision of the Nearctic Species of the Genus Phronia,” by Raymond J. Gagne
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“A Revision of the Nearctic Species of the Genus Phronia,” by Raymond J. Gagne
“Notes on Collecting Syrphid Flies,” by Howard V. Weems, Jr.
“The Fishery of Lake Atitlán, Guatemala,” by Troy C. Dorris and Robert C. Summerfelt
Dr. E. O. Essig, 1937-1941; Dr. H. E. Ewing, 1938; Dr. Nathan Fastem, 1935
Identification lists of Specialists