G. R. Crotch

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A revision of the coleopterous family Erotylidae / G.R. Crotch.

G. R. Crotch, 1901 .

Revision of the Dytiscidæ of the United States

G. R. Crotch, 1872 .

Check list of the Coleoptera of America, north of Mexico / by G. R. Crotch.

G. R. Crotch, E. P. Austin, 1873 .

A Revision of the Coleopterous Family Coccinellidae

G. R. Crotch, 2013 .

A revision of the coleopterous family Coccinellid. By George Robert Crotch, M.A.

G. R. Crotch, 1874 .

Descriptions of New Species of Coleoptera from the Pacifie Coast of the United States

G. R. Crotch, 2022 .

List of all the Coleoptera described A.D. 1758-1821, referred to their modern Genera

G. R. Crotch, 1871 .

Materials For The Study Of The Phytophaga Of The United States...

G. R. Crotch, 2011 .

Synopsis of the Endomychidæ of the United States

G. R. Crotch, 2022 .

Revision of the Coccinellidæ of the United States

G. R. Crotch, 1872 .