Injury experience in quarrying, 1961-63

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U. S. Dept. of the Interior, Bureau of Mines, 1972 - Technology & Engineering - 184 pages
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Contents

Αβ 8ΪΓ3 0Ϊ
Β11 ΙηητΥ εχρειίεηοε αηά επιρ1ογιηεηΐ άαΐα οη Ιίιηεεΐοηθ ορεΓα
Β22 Ιηιατγ εχρεΓΐεηεε ηά επιρίογπιεηΐ άειΐει ειΐ άΐπιεηβΐοη εΐοηε

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