The forms of the common Old World swallowtail butterfly (Papiliomachaon) in North America, with descriptions of two new subspecies
- 1 January 1932
- journal article
- Published by Smithsonian Institution in Proceedings of the United States National Museum
- Vol. 81 (2934) , 1-15
- https://doi.org/10.5479/si.00963801.81-2934.1
Abstract
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