Text ( visual ) : unmediated Ecological isolation in birds / David Lack ; main illus. by Robert Gillmor. -- Cambridge : Harvard University Press , 1971. -- xi, 404 p. : ill., map ; 23 cm. -- Includes bibliographical references (p. 357-374) and indexes. -- ISBN 0674224426 ; (BD01033827) ; https://ci.nii.ac.jp/ncid/BD01033827 Author Heading(s): Lack, David Lambert ; Gillmor, Robert. -- Classification(s): LCC : QH401 ; DC : 598.2/5/24. -- Subject Heading(s): LCSH : Bird populations ; LCSH : Isolating mechanisms