Category:Quarries and mines exploiting the Franciscan Complex
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This category has the following 5 subcategories, out of 5 total.
Media in category "Quarries and mines exploiting the Franciscan Complex"
This category contains only the following file.
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Gravel pit behind Concord Walnut Creek P6193679 (27374562433).jpg 4,032 × 3,024; 4.17 MB