"Fur seals." . . . . "Amino acids." . . "The Northen fur seal" . . . "Booklet describing early history of fur sealing; the distribution and movement of northern fur seals; Callorhinus Ursinus, their food, physical characteristics, reproduction and mortality and disease, management and research; sealing on the Pribilof Islands and processing and sale of fur seal skins."@en . . . "The northern fur seal" . "The northern fur seal"@en . . . . . . . . . . "The Northern Fur Seal" . . . . . . . . . . . . . "Callorhinus ursinus." . .