This is a well-illustrated treatment of and guide to all the fossil and present-day species of butterflies in one of the richest areas in North America for butt

The most diverse fossil bed in the United States provides a unique picture of what life was like 34 million years ago. In the rocks of Florissant, Colorado, lyi

This comprehensive guide to the fossil butterflies of Florissant offers a fascinating glimpse into an ancient world. Featuring detailed illustrations and scient

Extract from the eighth annual report of the Director [of the U.S. Geological Survey], 1886-'87.

This illustrated field guide describes the biological and ecological world of butterflies