"Birds Food." . . . . "Økologi Plantegeografi." . . "Økologi Plantegeografi" . "Aves" . . "Treaarsekspeditionen til Christian X's Land (1931-1934)" . . . "Treaarsekspeditionen til Christian X's land (1931-1934)" . "Ptarmigans." . . "Studies on the food of the east Greenland ptarmigan, especially in its relation to vegetation and snow-cover"@en . . "Studies on the Food of the East Greenland Ptarmigan especially in its Relation to Vegetation and Snow-Cover" . "Studies on the food of the East Greenland ptarmigan : especially in its relation to vegetation and snow-cover" . . "Studies on the food of the East Greenland ptarmigan, especially in its relation to vegetation and snow-cover" . . . . . "Studies on the food of the east Greenland ptarmigan especially in its relation to vegetation and snow-cover" . . . "Studies on the food of the east Greenland ptarmigan especially in its relation to vegetation and snow-cover"@en . . . . "Studies on the food of the East Greenland Ptarmigan especially in its Relation to Vegetation and Snow-cover"@da . . . . . . . . "Studies on the food of the East Greenland ptarmigan, especialliy in its relation to vegetation and snow-cover" . . . . "Studies on the food of the East Greenland Ptarmigan especialy in its relation to vegetation and snow-cover" . "Studies on the food of the East Greenland ptarmigan especially in its relation to vegetation and snowcover" . . . . . . "Studies on the food of the East Greenland ptarmigan, especially in its relation to vegetation and snowcover" . . "Lagopèdes Alimentation Groenland (est)." . . "Lagopèdes Alimentation Groenland (est)" .