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