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Comparison of Methods of Sewage Purification ⠃⠗⠋ braille edition
Grade 1 — uncontracted, letter-for-letter. Translated on this server by our own braille engine (BRF — Braille Ready Format, Library of Congress fdd000551). View Grade 2 instead.
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45,216 braille cells · 47 embossed pages at 40×25 · 444 unrepresentable characters omitted
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