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Spiders - Willis John Gertsch
Report on some arachnids from Barro Colorado Island, Canal Zone (American Museum novitates) - Willis John Gertsch
The fulva group of the spider genus Steatoda (Araneae, Theridiidae) (American Museum novitates) - Willis John Gertsch
The spider family Plectreuridae (American Museum novitates) - Willis John Gertsch
The spider family Diguetidae (American Museum novitates) - Willis John Gertsch
Descriptions of American spiders of the family Symphytognathidae (American Museum novitates) - Willis John Gertsch
Descriptions of new American Theridiidae (American Museum novitates) - Willis John Gertsch
Notes on American spiders of the family Dictynidae (American Museum novitates) - Willis John Gertsch
A review of the genus Hypochilus and a description of a new species from Colorado (Araneae, Hypochilidae) (American Museum novitates) - Willis John Gertsch