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Consistance de la roche (Différens degrés de).
Couches..

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Couches de houille en selle, en jatte, en V, en
chevron, en cul de chaudron, etc.
Couches de moyenne épaisseur (Exploitation des)
Couches et filons puissans (Exploitation des).
Couches minces (Exploitation des).

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Disposition des minerais dans l'intérieur de la terre.

Division du temps pour le travail.

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35 et 36

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19-26 30

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