New Silurian Heterostraci from southeastern Yukon / Denison, Robert H. (Robert Howland), 1911-1985. Hovdebo, H. R. contributor The California Standard Company, Edmonton, Alberta Lenz, A. C. (Alfred C.) 1929- contributor The California Standard Company, Edmonton, Alberta Bamber, E. W. contributor Geological Survey of Canada, Ottawa, Canada text [Chicago] Chicago Natural History Museum, 1963. eng p. 105-141 : 24 cm. Caption title. "January 22, 1963." Includes bibliographical references (p. 141). Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-). Heterostraci. Paleontology -- Silurian. Paleontology -- Yukon.