TY  - BOOK
AU  - Nettleship,David N.
TI  - Census techniques for seabirds of arctic and eastern Canada
T2  - Occasional paper / Canadian Wildlife Service
U1  - 598.07232 23
PY  - 1976///
CY  - [Ottawa]
PB  - Canadian Wildlife Service
KW  - Sea birds
KW  - Aves marinas
N1  - Bibliografía: p. 25
ER  -