Four Volumes, Containing Nearly 200 Illustrations, 144 of Which are in
Color
_Fully Indexed_
Birds Worth Knowing
By Neltje Blanchan
Trees Worth Knowing
By Julia Ellen Rogers
Butterflies Worth Knowing
By Clarence M. Weed
Flowers Worth Knowing
Adapted from the works of Neltje Blanchan
By Asa Don Dickinson
The Worth Knowing Series forms a much needed in-between link to the
larger Nature Library books and the handy, but necessarily limited,
Pocket Nature Guides.
Each of these four volumes covers the most interesting American varieties
of the subject treated.
A general introduction to each subject is followed by detailed
descriptions of the most interesting families, and of the more important
members in each group.