TY  - BOOK
ED  - American Geological Institute
ED  - American Geological Institute
ED  - National Science Foundation (U.S.)
TI  - Investigating the earth
PY  - 1972///
CY  - Boston
PB  - Houghton Mifflin
KW  - Earth sciences
KW  - Earth
N1  - Sponsored by the American Geological Institute; supported by the National Science Foundation; Includes bibliographies
ER  -