Author
Malaysia. Jabatan Galian
3
British Columbia. Dept. of Mines
2
France. Commission des Annales des mines
2
India. Dept. of Mines
2
Indian Bureau of Mines. Mineral Statistics Division
2
Peru. Cuerpo de Ingenieros de Minas
2
Austria. Bundesministerium für Handel und Verkehr
1
Austria. Oberste Bergbehörde
1
Bahia (Brazil : State). Departamento Estadual de Estatística
1
Belgium. Administration des mines
1
British Columbia. Minister of Mines' Office
1
Escola Nacional de Minas e Metalurgia (Brazil)
1
Gujarat (India). Directorate of Geology and Mining
1
India. Central Coal Mines Rescue Stations Committee
1
India. Ministry of Mines
1
Indian Bureau of Mines
1
Malaysia. Kementerian Pertanian dan Tanah
1
Nova Scotia. Dept. of Mines
1
Queensland. Dept. of Mines
1
Shigen Gijutsu Shikenjo (Japan)
1
Sichuan sheng di zhi diao cha suo
1
Universidade Federal de Ouro Preto. Escola de Minas
1
Venezuela. Ministerio de Fomento
1
Venezuela. Ministerio de Minas e Hidrocarburos
1
Verein der Bergwerksbesitzer Österreichs
1