"March 1985."Distributed to depository libraries in microfiche.Mode of access: Internet
"April 1983."Distributed to depository libraries in microfiche.Caption title.Bibliography: p. 21-23....
"March 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 36.Mode ...
"March 1984."Distributed to depository libraries in microfiche.Cover title.Mode of access: Internet
"February 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 34.Mo...
"August 1988."Distributed to depository libraries in microfiche.Cover title.Includes bibliographical...
"January 1995."Distributed to depository libraries in microfiche.Cover title.Includes bibliographica...
"January 1987."Distributed to depository libraries in microfiche.Bibliography: p. 22.Mode of access:...
"October 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 33-34....
"January 1989."Distributed to depository libraries in microfiche.Cover title.Includes bibliographica...
"Bureau of Mines special report" on map envelope.Bibliography: p. 15.Mode of access: Internet
"June 1984."Distributed to depository libraries in microfiche.Bibliography: p. 12.Mode of access: In...
Photocopy. Springfield, Va. : National Technical Information Service, 1978"PB 283 120."Mode of acces...
"June 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 58-60.Mod...
"October 1985."Distributed to depository libraries in microfiche.Caption title.Bibliography: p. 13-1...
"April 1989."Distributed to depository libraries in microfiche.Includes bibliographical references (...
"April 1983."Distributed to depository libraries in microfiche.Caption title.Bibliography: p. 21-23....
"March 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 36.Mode ...
"March 1984."Distributed to depository libraries in microfiche.Cover title.Mode of access: Internet
"February 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 34.Mo...
"August 1988."Distributed to depository libraries in microfiche.Cover title.Includes bibliographical...
"January 1995."Distributed to depository libraries in microfiche.Cover title.Includes bibliographica...
"January 1987."Distributed to depository libraries in microfiche.Bibliography: p. 22.Mode of access:...
"October 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 33-34....
"January 1989."Distributed to depository libraries in microfiche.Cover title.Includes bibliographica...
"Bureau of Mines special report" on map envelope.Bibliography: p. 15.Mode of access: Internet
"June 1984."Distributed to depository libraries in microfiche.Bibliography: p. 12.Mode of access: In...
Photocopy. Springfield, Va. : National Technical Information Service, 1978"PB 283 120."Mode of acces...
"June 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 58-60.Mod...
"October 1985."Distributed to depository libraries in microfiche.Caption title.Bibliography: p. 13-1...
"April 1989."Distributed to depository libraries in microfiche.Includes bibliographical references (...
"April 1983."Distributed to depository libraries in microfiche.Caption title.Bibliography: p. 21-23....
"March 1983."Distributed to depository libraries in microfiche.Cover title.Bibliography: p. 36.Mode ...
"March 1984."Distributed to depository libraries in microfiche.Cover title.Mode of access: Internet