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Robert Michael Pyle

Chasing Monarchs: Migrating with the Butterflies of Passage
Chasing Monarchs: Migrating with the Butterflies of Passage
 National Audubon Society Field Guide to North American Butterflies
National Audubon Society Field Guide to North American Butterflies
1981
 Mariposa Road: The First Butterfly Big Year
Mariposa Road: The First Butterfly Big Year
2010