Petrographic methods, the authorized English translation of Part 1, Anleitung zum gebrauch des polarisationsmikroskops (3d rev. ed.) and Part 2, Die gesteinsbildenden mineralien (2d rev. ed.) by Dr. Ernst Weinschenk ... rendered into English by Robert Watson Clark
Weinschenk, Ernst Heinrich Oskar Kasimir, 1865-1921; Clark, Robert Watson, 1884-