Brownlee, W.C.2010-02-152010-02-151975http://hdl.handle.net/1969.3/19968n.p.The Attwater's prairie chicken spring population census, utilizing two airplanes, one helicopter, and ground counts was completed March 25, 1975. The total Attwater's prairie chicken population was estimated to be 2,240 birds, an increase of 11.8 percent from the 1974 census.birdsattwaters prairie chickenabundanceaerial surveyspopulation dynamicscensusBook