List of Quarries in Illinois & Quarry Links Photos...
(The following information is an advertisement in Pit and Quarry: Sand – Gravel – Stone, magazine, December 1921, pp. 114.) H. W. Caldwell & Son Co. ... Diamond Drill Cores stand first in value, in the opinion of engineers, as evidence of the worth of a mineral property; because they show positively, whether the mineral sought is present ...
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