From card: "# 72403 - Illus. in USNM Rept, 1900; fig. 92; p. 302."
72402 and 72403 described p. 113 in Brown, James Temple. 1883. The whale fishery and its appliances. Washington: Govt. print. off.: "Beluga-Lance Butts. Two butts made of walrus ivory, wedge-shaped, so as to be conveniently driven into the end of the lance, and provided with shoulders, by means of which they are seized and lashed. Length, 3 3/4 inches. 72403. Length, 4 inches. 72402. Alaska. C. L. McKay."