ECOLOGY AND BIOLOGY OF THE PACIFIC WALRUS 



279 



Tsalkin, V.I. 1937. Materials on the biology of the walrus of the Franz Josef Archipelago. 



Biul. Mosk. Obsch. Isp. Prirody, otd. biol. 46:43-51. 

 U.S. Navy. 1946. Ice atlas of the Northern Hemisphere. U.S. Naval Hydrographic 



Office, Washington, D.C., Publ. 550. 106 pp. 

 U.S. Navy. 1956. Marine climatic atlas of the world. Volume 2. North Pacific Ocean. 



U.S. Government Printing Office, NAVAER 50-1C-529. 275 pp. 

 U.S. Navy. 1958. Oceanographic atlas of the polar seas. Part II, Arctic. U.S. Naval 



Hydrographic Office, Washington, D.C., Publ. 705. 149 pp. 

 Van Horn, D. R., and B. E. Baker. 1971. Seal milk. II. Harp seal (Pagophihis groenlandi- 



cus) milk: effects of stage of lactation on the composition of the milk. Can. J. Zool. 



49:1085-1088. 



Verheyen, R. 1954. Monographic ethologique de I'hippopotame {Hippopotamus amphib- 

 iiis Linne). Exploration du Pare National Albert. Inst, pares nat. Congo Beige, Brussels. 

 91 pp. 



Vibe, C. 1950. The marine mammals and the marine fauna in the Thule District (North- 

 west Greenland) with observations on ice conditions in 1939-41. Medd. om Gr0nl. 

 150(6):1-115. 



Vibe, C. 1956. The walrus west of Greenland. Int. Union Prot. Nat., Pap. Proc. Tech. 

 Meeting 5:79-84. 



Walker, E. P., F. Wamick, S. Hamlet, K. I. Lange, M. A. Davis, H. E. Uible, and 

 P. F. Wright. 1964. Mammals of the world. Johns Hopkins Press, Baltimore. 1500 pp. 



Watson, G. E., and G. J. Divoky. 1972. Pelagic bird and mammal observations in the 

 eastern Chukchi Sea, early fall 1970. Pages 111-172 in WEBSEC-70, an ecological 

 survey in the eastern Chukchi Sea, September-October 1970. U.S. Coast Guard Oceano- 

 graphic Unit, Oceanogr. Rep. 50 (CG 373-50). 



Webster, C. J. 1954. The Soviet expedition to the Central Arctic, 1954. Arctic 7:58-80. 



Wilke, F. 1942. Large walrus tusk from St. Paul Island, Alaska. Murrelet 23:17. 



Wimsatt, W. A. 1963. Delayed implantation in the Ursidae, with particular reference 

 to the black bear (Ursiis americanm Pallas). Pages 49-74 in A. C. Enders, ed. Delayed 

 implantation. University of Chicago Press, Chicago. 



Winters, L. M., W. W. Green, and R. E. Comstock. 1942. Prenatal development of the 

 bovine. Univ. Minn. Agric. Exp. St., Tech. Bull. 151. 50 pp. 



Yablokov, A. V., and V. M. Bel-'kovich. 1963. Observations on walruses on hauling 

 grounds in the Gulf of Anadyr and the Chukchi Sea. Kraev. Zap. Obi. Kraev. Muz. 

 Uprav. Magadansk. Oblispolkoma 4:156-174. 



Yablokov, A. V., and G. A. Klevezal'. 1964. Vibrissae of whales and seals, their distribu- 

 tion, structure, and significance. Pages 48-81 in S. E. Kleinenberg, ed. Morfologiches- 

 kie osobennosti vodnykh mlekopitaiuschikh. Akademii Nauk SSSR, Moscow. 



Yurakhno, M. V., and V. V. Treschev. 1972. An investigation of the helminth fauna 

 of the Pacific walrus. Pages 280-283 in V. A. Arsen ev, V. M. Bel'kovich, V. A. Zem- 

 skii, B. A. Zenkovich, V. E. Sokolov, and K. K. Chapskii, eds. Tezisy doklad. 5ogo 

 Svesoiuz. sovesch. izuch. morsk. mlekopit. Chast 2. Akademii Nauk SSSR, 

 Makhachkala. 



Zander, H. A. and B. Hurzeler. 1958. Continuous cementum apposition. J. Dent. Res. 

 37:1035-1044. 



Zenkevitch, L. 1963. Biology of the seas of the USSR. Interscience, New York. 955 pp. 

 Zenkovich, B. A. 1938(3. Development of marine mammal hunting in Chukotka. Priroda 



(Moscow) 1938(1 1-12) :59-63. 

 Zenkovich, B. A. 1938fc. On the grampus or killer whale. Grampus orca Linn. Priroda 



(Moscow) 1938(4): 109-112. 

 Ziegler, A. C. 1961. Occurrence of os clitoridis in Microtus. J. Mammal. 42:101-103. 



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