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The chemistry, properties and tests of precious stones ⠃⠗⠋ braille edition

Grade 2 — contracted English braille (EBAE-compatible subset). Translated on this server by our own braille engine (BRF — Braille Ready Format, Library of Congress fdd000551). View Grade 1 instead.

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148,688 braille cells · 153 embossed pages at 40×25 · 802 unrepresentable characters omitted

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