01015agm a2200241u  450000100160000000500170001600700240003300800410005703500230009803500110012103500200013204000130015224500810016526000830024630000390032950000470036850000350041552001790045065000180062970000240064771000390067171000630071099575052010231120260227104100.0mrrcaaad               840127s1983    dcu023u r        0mleng d  a(TU)000575052UTK019 a604940  a(OCoLC)10344574  aTKNcTKN00aFossils, clues to the pasth[motion picture] /cNational Geographic Society.  aWashington, D.C. :bNational Geographic Society, Educational Services,cc1983.  a1 film reel :bsd., col. ;c16 mm.  aIntended audience: Grades 7-12 and adults.  aIssued also as videorecording.  aDr. Donald C. Johanson discusses what a fossil is and some of the ways in which they are formed. He also discusses what fossils reveal and how scientists determine their age. 0aPaleontology.1 aJohanson, Donald C.2 aNational Geographic Society (U.S.)2 aNational Geographic Society (U.S.).bEducational Services.