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	1.	No cover image available Principles of invertebrate paleontology by Robert R. Shrock [and] William H. Twenhofel. by Twenhofel, William H. (William Henry), 1875-1957 Shrock, Robert R. (Robert Rakes), 1904-1993 [joint author.] Series: McGraw-Hill series in geology Edition: 2d ed. Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York: McGraw-Hill, 1953 Availability: Items available for loan: Earth Sciences and Engineering Library Collection (2)Call number: QE 770 .T84 1953, ... Place hold Add to cart (remove)
	2.	No cover image available Sequence in layered rocks / shrock, Robert R. by Shrock, Robert R. (Robert Rakes), 1904-1993 Edition: lst ed. Material type: Text; Format: print ; Literary form: Not fiction Publication details: New York: McGraw-Hill Book Co., 1948 Availability: Items available for loan: Earth Sciences and Engineering Library Collection (5)Call number: QE431.5 .S45 1948, ... Place hold Add to cart (remove)

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