Asa gray : american botanist, friend of Darwin /

by Dupree, A. Hunter
Published 1988

Darwiniana : essays and reviews pertaining to Darwinism. /

by Gray, Asa 1810-1888
Published 1963

The plan of ST. Gall : a study of the architecture and economy of, and life in a paradigmatic carolingian monastery /

by Horn, Walther Wilhelm Adolf 1908-1995
Published 1979