Category:Reasons suggestive of mining on physical principles for gold and coal

Media in category "Reasons suggestive of mining on physical principles for gold and coal"

The following 2 files are in this category, out of 2 total.

Reasons suggestive of mining on physical principles for gold and coal (Page (3)) BHL48227550.jpg 1,417 × 2,232; 277 KB
Reasons suggestive of mining on physical principles for gold and coal (Page 4) BHL48227549.jpg 1,417 × 2,232; 156 KB

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