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External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1989 /
by Timothy C. Willoughby [and others].

APA Citation

Willoughby, T. C., Geological Survey (U.S.). (1991). External quality-assurance results for the National Atmospheric Deposition Program/National Trends Network during 1989. Denver, Colo.: U.S. Dept. of the Interior, U.S. Geological Survey .

MLA Citation

Willoughby, Timothy C, and Geological Survey (U.S.). External Quality-assurance Results for the National Atmospheric Deposition Program/National Trends Network During 1989. Denver, Colo.: U.S. Dept. of the Interior, U.S. Geological Survey , 1991.

Warning: These citations may not always be complete (especially for serials).