Publication

1986 - Dept. of the Interior, U.S. Geological Survey, Reston, Va., Virginia

Language

English

Word Count

4,750 words, Guess

Page Count

19 pages

Identifiers

Classifications

  • DDC025/.0691
  • LCCG70.2 .R63 1986

Subjects

Series Statement

  • U.S. Geological Survey circular ;
  • 977

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