Johnston, D.W. 1990. Descriptions of surveys: Breeding Bird Census. Pages 33-36 in J.R.
Sauer, and S. Droege, eds. Survey designs and statistical methods for the estimation of
avian population trends. U.S. Fish and Wildl. Serv. Biol. Rept. 90(1).
[ - ]
Johnston, D.W. 1990. Descriptions of surveys: Breeding Bird Census. Pages 33-36 in J.R...
[ + ]
Johnston, D.W. 1990. Descriptions of surveys: Breeding Bird Census. Pages 33-36 in J.R.
Sauer, and S. Droege, eds. Survey designs and statistical methods for the estimation of
avian population trends. U.S. Fish and Wildl. Serv. Biol. Rept. 90(1).