00305nam a2200109Ia 450000500170000000800410001708200120005810000220007024500530009226000420014530000080018720260225051008.0260224s9999||||xx |||||||||||||| ||und||  a592 SHR  aRobert R. Shrock  0aPrinciples of inverteberate paleontology 2nd ed.  aNew York: McGraw-Hill Book Co. c1953  a816