International regional meeting on conservation of wildfowl resources (Europe, western Asia, northern and tropical Africa), Leningrad, USSR, 25-30 September 1968 : proceedings
1970
Isakov, Yu. A. |
Isakov, Yu. A.
International regional meeting on conservation of wildfowl resources, Europe, Western Asia, Northern and Tropical Africa, Leningrad, USSR, 25-30 September 1968 : proceedings
1970
Isakov, Yu. A. |
Proceeding of the Symposium on the Mapping of Waterfowl Distributions, migrations and habitats
1981
Matthows, G. V. T. |
Isakov, Yu. A. |