"This document was prepared ... in conjunction with the U.S. Geological Survey (USGS)"--Acknowledgements. "September, 1993." Shipping list no.: 99-0187-M. "402-R-93-028"--Cover.
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Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., 1998. 2 microfiches : negative.
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