562 Shi I2 Shimer, Hervey Woodburn, 1872- Index fossils of North America; a new work based on the complete revision and reillustration of Grabau and Shimer´ s ´´North american index fossils´´, by Hervey Woodburn Shermer and Robert Rakes Shreck. Cambridge, Mass., The M.I.T. Press c1944.ix, 837 p. ilus., láms. 28 cm. ´´references´´: p. 5-8