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51 (LI) — 1940-1941
Ignition, Causes, 61.
Inaccessible Distances and Heights, 312.
Incline, Self-acting, 30.
Incombustible, Nearly, 3.
Indexing Coal Seams, 16.
India, Coal Mining, 229.
Indian Trade Administration, 104.
Indicated H.P., 248.
Induction Coil and Transformer, 282.
Industry in War Time, 134.
Inflammability, Limits, 111.
Injectors for Feed Water, 398.
Inset Loading, 270.
Investigations, Coal Dust, 79.
Iron Mine, Sulaipat, 117.
Iron Ore in S.A., 328.
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