Author: Schuster, M., 1881.:
Title: Ueber die optische Orientierung der Plagioklase.
Description: Tschermak's Miner. Petrogr. Mitth., 3(2-3): pp. 117-284, 3 plates, 3 figs. Extract, old cloth-backed boards. - See: Johannsen, Manual of petrographic methods, p. 392. The introduction (pp. 117-140) covers the history of the subject.

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