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international geological congress 15th 1929 pretoria
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Guide book, XV session, South Africa, 1929
International Geological Congress (15th 1929 Pretoria) · Wallachs' ltd., printers
23 sayfa · 1929
Geology
Compte rendu of the XV. session, South Africa, 1929
International Geological Congress (15th 1929 Pretoria, etc.) · Wallachs' Ltd.
Sayfa sayısı yok · 1930
Geology / Congresses
The gold resources of the world
International Geological Congress (15th 1929 Pretoria, South Africa) · Bureau of the Congress
457 sayfa · 1930
Ore deposits / Gold mines and mining / Gold
Guide book
International Geological Congress (15th 1929 Pretoria, South Africa) · Wallachs' ltd., printers
23 sayfa · 1929
Geology