Buckland, S. T. Introduction to distance sampling : estimating abundance of biological populations / by S.T. Buckland, [et al....] - New York : Oxford University Press, 2001. - xv, 432 p. : ill., map ; 24 cm. ISBN: 9780198509271 Subjects--Topical Terms: Animal populations --Estimates; Sampling. Dewey Class. No.: 591.7880727 BUC / 2446