Four hundred years of mining history in Mexico, 1521 to 1937.

"April 21, 1947."

Labor law and practice in Colombia

Bibliography: p. 87.

Labor law and practice in Colombia /

Cover title.

Drug control : U.S.-supported efforts in Colombia and Bolivia /

"B-225282." - p. [1]

Small farmer credit in Colombia.

PB 224 029

Mining wastes in the West : risks and remedies, overview.

"August 1987."

Mining wastes in the West : fact sheet.

"August 1987."

Areawide environmental assessment on the development of a NEPA compliance strategy for new source coal mining activity in the western Kentucky coal field /

Mode of access: Internet.

The doctorate in education; an inquiry into conditions affecting pursuit of the doctoral degree in the field of education.

Vol. 2 by H. E. Moore, J. H. Russel, and D. G. Ferguson.

Chronic respiratory disease in coal miners : follow-up of two mining communities in West Virginia /

Mode of access: Internet.

The crane helicopter and its capabilities and prospects in Colombia, South America.

Mode of access: Internet.

Modern missions on the Spanish main; impressions of Protestant work in Colombia and Venezuela,

"A brief reading list on Colombia and Venezuela": p. 331-334.

A Review of mining operations in the state of South Australia during the half year ended .

Title varies slightly.

Mining industry in Quebec.

Mode of access: Internet.

Economic controls and commercial policy in Colombia ...

Cover title.