一般注記"Based upon research conducted under an agreement between the University of Alabama and the Bureau of Mines."
Distributed to depository libraries in microfiche
Errata inserted
Physical description for original version: 15 p. : 28 cm
書誌注記Includes bibliographical references (p. 15)
原資料等に関する注記原資料の出版事項: Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1990
SUPTDOC番号: I 28.23: 9297
GPO管理番号: 637-A (MF)