Statistical review of Ontario's mineral industry in 1929-Classes for prospectors, 1929-30-Mines of Ontario in 1929-Mining accidents in 1929.
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| Typ dokumentu: | Kniha |
| Jazyk: |
angličtina |
| Vydavatel: |
Toronto :
King's Most Excellent Majesty,
1930.
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| Edice: |
Annual report of the Ontario Department of mines ;
Vol. XXXIX, Part I, 1930 |
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