Small-scale mining
McDivitt
Small-scale mining prepared by James F. McDivitt, Dennis Lock and others, on behalf of the Association of Geoscientists for International Development - London Intermediate Technology 1990 - xii,99 p. ill. 30 cm
1853390127
Small-scale mining prepared by James F. McDivitt, Dennis Lock and others, on behalf of the Association of Geoscientists for International Development - London Intermediate Technology 1990 - xii,99 p. ill. 30 cm
1853390127