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Cover of Bird census techniques by colin j. bibby,neil d. burgess,david a. hill

Bird census techniques

By Colin J. Bibby,Neil D. Burgess,David A. Hill

Cover of Bird monitoring methods by gillian gilbert,david wingfield gibbons,david w. gibbons,julianne evans

Bird monitoring methods

By Gillian Gilbert,David Wingfield Gibbons,David W. Gibbons,Julianne Evans