References
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The Birds of Western Pennsylvania and Adjacent Regions
Leberman
Carnegie Museum of Natural History
1988
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Atlas of Breeding Birds in Pennsylvania
Dan Brauning
University of Pittsburgh Press
1992
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Birding in Western Pennsylvania
Bates Estabrooks
Audubon Society of Western Pennsylvania
1996
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A Field List of the Birds of Western Pennsylvania and Adjacent Regions
R C Leberman
Carnegie Museum of Natural History
1988
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The Birds of Pennsylvania
G McWilliams and D Brauning
Cornell University Press
2000
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Annotated List of the Birds of Pennsylvania
Santner and Brauning and Schwalbe and Schwalbe
Pennsylvania Biological Survey
1992
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Birds of Western Pennsylvania
W E C Todd
Carnegie Museum
1940
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Polk Wetlands
Jerry Stanley
Pennsylvania Birds 15:10
PSO
2001
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Two Mile Run Lake
Russ States
Pennsylvania Birds 3:52
PSO
1989
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Annotated List of the Birds of Pennsylvania - Second Edition
Franklin Haas and Barbara Haas
Pennsylvania Biological Survey
2005
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Second Atlas of Breeding Birds in Pennsylvaniua
Andrew Wilson, Daniel Brauning, and Robert Mulvihill
The Pennsylvania State University Press
2012
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