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Publication Extents

Not all publications have extents, not all extents are completely accurate
The breeding bird survey, 1966
Chandler S. Robbins, Willet T. Van Velzen
1967, Special Scientific Report - Wildlife 102
A Breeding Bird Survey of a large section on North America was conducted during June 1966. Cooperators ran a total of 585 Survey routes in 26 eastern States and 4 Canadian Provinces. Future coverage of established routes will enable changes in the abundance of North American breeding birds to be...