| Butterflies of Pennsylvania: A Field Guide - James L. Monroe • libris.ro | 148.80 RON |
| Butterflies of Pennsylvania: A Field Guide, Paperback - James L. Monroe • elefant.ro | 149.21 RON |
Butterflies of Pennsylvania will serve as a handy reference for a broad readership including students and educators, backyard butterfly enthusiasts and gardeners, conservationists and naturalists, public and school libraries, entomologists, lepidopterists, and butterfly watchers in general.