General embryological information service - Hubrecht-Laboratorium (Embryologisch Instituut) (Hubrecht Laboratory, 1978)

General embryological information service - Hubrecht-Laboratorium (Embryologisch Instituut) (Hubrecht Laboratory, 1979)

General embryological information service - Hubrecht-Laboratorium (Embryologisch Instituut) (Hubrecht Laboratory, 1980)

General guide to the exhibition halls of the American Museum of Natural History - American Museum of Natural History (American Museum of Natural History, 1953)

General guide to the exhibition halls of the American Museum of Natural History - American Museum of Natural History (American Museum of Natural History, 1956)

General guide to the exhibition halls of the American Museum of Natural History - American Museum of Natural History (American Museum of Natural History, 1958)

The general status of Alberta wild species 2000 - Alberta. Alberta Environment. (Alberta Environment, 2001)