TY  - ADVS
AU  - Johanson,Donald C.
ED  - National Geographic Society (U.S.)
ED  - National Geographic Society (U.S.).
TI  - Fossils, clues to the past
PY  - 1983///
CY  - Washington, D.C.
PB  - National Geographic Society, Educational Services
KW  - Paleontology
N1  - Intended audience: Grades 7-12 and adults; Issued also as videorecording
N2  - Dr. 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
ER  -