Index fossils of North America - Shimer, Hervey Woodburn, 1872-; Shrock, Robert Rakes, 1904- (Cambridge, Mass. : M.I.T. Press, 1972)
A new work based on the complete revision and reillustration of Grabau and Shimer's'North American index fossils'.
Keywords: Paleontology -- North America; Invertebrates, Fossil