TY - BOOK AU - Colbert EH AU - Northrop SA TI - Guidebook for the fouth field conference of the Society of Vertibrate Paleontology in NorthwEastern New Mexico 20-24 June 1950 U1 - 566.063 PY - 1950/// CY - Chicago PB - Am Museum of Natural History KW - Fossil vertebrates ER -