Description |
x, 190 pages, 7 unnumbered pages of plates : illustrations, maps ; 20 cm |
Note |
"This book is the outgrowth of a series of eight lectures given at the Lowell institute in January, 1944."--Preface. |
Bibliography |
Includes bibliographical references. |
Subject |
Birds.
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Birds. |
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Birds -- Migration.
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Birds -- Migration. |
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