Summary

Collier's New Encyclopedia — Connecticut… (1921)

Copper and lead exist, but have never been mined with much profit. Silver occurs in minute quantities. There are immense quarries of red sandstone at Portland and Cromwell, and marble and limestone is quarried at Canaan and Washington, while the largest amount of orthoclase quarried in the United States comes from Glastonbury and Middletown.
Source: Wikisource

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