Svensson, Soren .
Bird Census Work and environmental Monitoring / Textual Documents SOREN SVENSSON. - Sweden : Ecological Research Committee , 1970. - 52p, ; .
Ecology - Birds - Symposium
574.5 / SVE
Bird Census Work and environmental Monitoring / Textual Documents SOREN SVENSSON. - Sweden : Ecological Research Committee , 1970. - 52p, ; .
Ecology - Birds - Symposium
574.5 / SVE