scholarly journals A Swift Guide to Butterflies of North America, Second EditionButterflies of Pennsylvania: A Field Guide

2017 ◽  
Vol 63 (4) ◽  
pp. 261-262
Author(s):  
Clyde E Sorenson
Keyword(s):  
1951 ◽  
Vol 34 (3) ◽  
pp. 122
Author(s):  
Lewis Berner ◽  
Alexander B. Klots

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