American wildlife & plants : a guide to wildlife food habits : the use of trees, shrubs, weeds, and herbs by birds and mammals of the United States Alexander C. Martin, Herbert S. Zim, Arnold L. Nelson.

by Martin, Alexander Campbell, 1897-
Published 1961

Flowers : a guide to familiar American wildflowers by Herbert S. Zim and Alexander C. Martin ; illustrated by Rudolf Freund.

by Zim, Herbert S. (Herbert Spencer), 1909-1994
Published 1950