File:MN2769.jpg

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Revision as of 10:12, 28 June 2020 by Scotfot (talk | contribs) (Chalk and clay for Portland cement - R T Roussel. Diorama, Museum of Practical Geology. From a Lantern slide. Credit: Christina Walsh.)
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Summary

Chalk and clay for Portland cement - R T Roussel. Diorama, Museum of Practical Geology. From a Lantern slide. Credit: Christina Walsh.

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current10:12, 28 June 2020Thumbnail for version as of 10:12, 28 June 20201,400 × 500 (498 KB)Scotfot (talk | contribs)Chalk and clay for Portland cement - R T Roussel. Diorama, Museum of Practical Geology. From a Lantern slide. Credit: Christina Walsh.

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