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FLUORINE MINERALS.
Penfield SL. Penfield SL. Science. 1883 Apr 27;1(12):331-2. doi: 10.1126/science.ns-1.12.331. Science. 1883. PMID: 17836991 No abstract available.
OPTICAL RESEARCHES ON GARNET.
Penfield SL. Penfield SL. Science. 1883 Jun 29;1(21):600. doi: 10.1126/science.ns-1.21.600. Science. 1883. PMID: 17770230 No abstract available.