Shimer, Hervey Woodburn,  1872- <br/><br/>
Index fossils of North America / 
by Hervey Woodburn Shimer and Robert Rakes Shrock. 
 - Cambridge, Mass. :  M.I.T. Press,  1972. 
 - ix, 837 p. :  ill. ;  28 cm. 
<br/><br/> A new work based on the complete revision and reillustration of Grabau and Shimer's'North American index fossils'. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleontology--North America.<br/>Invertebrates, Fossil.