plate 39, opaque & polarizing objects, and plate 42, rocks, from the micrographic dictionary: a guide to the examination and investigation of the structure and nature of microscopic objects, 1883 (biodiversity heritage library)
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plate 39, opaque & polarizing objects, and plate 42, rocks, from the micrographic dictionary: a guide to the examination and investigation of the structure and nature of microscopic objects, 1883 (biodiversity heritage library)