The Building Materials of Pennsylvania: I. Brownstones (Classic Reprint)

Excerpt from The Building Materials of Pennsylvania: I. Brownstones

The stones of the eastern part of the State more nearly resemble the New England brownstones than those farther west in the State, but even they have a high percentage of silica, a lower percentage of alumina and a much lower percentage of alkali than the (new England brownstones.

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