Coal Industry: Problems and Prospects : A Background Study.

MLA

Library of Congress. Coal Industry: Problems and Prospects : A Background Study. [Place of publication not identified] : [publisher not identified], 1978.

APA

Library of Congress. (1978). Coal Industry: Problems and Prospects : A Background Study. [Place of publication not identified] : [publisher not identified].

Chicago

Library of Congress. Coal Industry: Problems and Prospects : A Background Study. [Place of publication not identified] : [publisher not identified], 1978.