Birding in the United States: A Demographic and Economic Analysis. , U. F. & Service, W. In An addendum to the 2001 National Survey of Fishing, Hunting and Wildlife-Associated Recreation. 2001.
bibtex   
@incollection{us_fish_and_wildlife_service_birding_2001,
	title = {Birding in the {United} {States}: {A} {Demographic} and {Economic} {Analysis}},
	language = {en},
	booktitle = {An addendum to the 2001 {National} {Survey} of {Fishing}, {Hunting} and {Wildlife}-{Associated} {Recreation}},
	author = {US Fish {and} Wildlife Service},
	year = {2001},
}

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