TY  - BOOK
AU  - Heape,Walter
AU  - Marshall,F.H.A.
TI  - Emigration, migration and nomadism,
AV  - QL754 .H4
PY  - 1931///
CY  - Cambridge [Eng.]
PB  - W. Heffer & Sons ltd.
KW  - Animal behavior
KW  - Animal migration
N1  - Bibliography: p. 343-354
ER  -