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Scientific American Supplement, No. 1082, September 26, 1896

Note 1 — FIREDAMP TESTING STATION AT MARCHIENNE-AU-PONT.1

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H. Schmerber, Genie Civil, xxix, No. 11.—From the Colliery Guardian.

[2] Reproduced in the Colliery Guardian, vol. lxxi, p. 317.

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