Home » Mineralogy of Pennsylvania 19221965: Supplementing Updating Gordon’s “The Mineralogy of Pennsylvania 1922 ”: Special Pub. No. 9 of the Acad. of Natural Sciences of Phila. by Arthur Montgomery
Mineralogy of Pennsylvania 19221965: Supplementing  Updating Gordon’s “The Mineralogy of Pennsylvania 1922 ”: Special Pub. No. 9 of the Acad. of Natural Sciences of Phila. Arthur Montgomery

Mineralogy of Pennsylvania 19221965: Supplementing Updating Gordon’s “The Mineralogy of Pennsylvania 1922 ”: Special Pub. No. 9 of the Acad. of Natural Sciences of Phila.

Arthur Montgomery

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HD Rogers (Geology of Pennsylvania, vol. 1, 1858, 95) recorded that good zirconcrystals had been found in talc on the slope of Chestnut Hill, ...