How to know the butterflies
How to know the butterflies: illustrated keys for determining to species all butterflies found in North America, north of Mexico, with notes on their distribution, habits, and larval food, and suggestions for collecting and studying them Paul R. Ehrlich, Anne H. Ehrlich; with sections contributed by the following specialists, D. L. Bauer... [et al.]
Publisher: Dubuque, Iowa : W.C. Brown Co., c1961.
ISBN: 0697048217
DDC: 595.789
LCC: QL548
Edition: bd
How to know the seaweeds
an illustrated manual for identifying the more common marine algae of both our atlantic and pacific coasts with numerous aids for their study
Publisher: Dubuque, Iowa, : W.c. Brown Co, 1956.
ISBN: 0697048829