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Books Books 1 - 4 of 4 on Pennsylvania has a specific gravity of 1.26 to 1.37; of Newcastle, England, 1.27;....  
" Pennsylvania has a specific gravity of 1.26 to 1.37; of Newcastle, England, 1.27; of Scotland, 1.27 to. 1.32; of France, 1.2 to 1.33; of Belgium, 1.27 to 1.3. The most prominent kinds are the following: 1374. 3. Caking Coal. A bituminous coal which... "
A text-book of mineralogy: with an extended treatise on crystallography and ... - Page 646
by Edward Salisbury Dana, James Dwight Dana - 1922 - 485 pages
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A treatise on coal mining, Volume 2, Parts 11-21

International Correspondence Schools - Coal mines and mining - 1900
...France, 1.2 to 1.33; of Belgium, 1.27 to 1.3. The most prominent kinds are the following: 1374. 3. Caking Coal. A bituminous coal which softens and becomes...the softened mass, are driven off, and a coherent, grayish-black, cellular, or fritted mass (coke) is left. Amount of coke left (or part not volatile)...
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Gases met with in mines ; Mine ventilation ; Economic geology of coal ...

International Correspondence Schools - Technology & Engineering - 1903
...France, 1.2 to 1.33; of Belgium, 1.27 to 1.3. The most prominent kinds are the following: 1374. 3. Caking Coal. A bituminous coal which softens and becomes...the softened mass, are driven off, and a coherent, grayish-black, cellular, or fritted mass (coke) is left. Amount of coke left (or part not volatile)...
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International library of technology: a series of textbooks for ..., Volume 37

International Textbook Company - Agriculture - 1903
...France, 1.2 to 1.33; of Belgium, 1.27 to 1.3. The most prominent kinds are the following: 1374. 3. Caking Coal. A bituminous coal which softens and becomes...the softened mass, are driven off, and a coherent, grayish-black, cellular, or fritted mass (coke) is left. Amount of coke left (or part not volatile)...
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I.C.S. Reference Library: A Series of Textbooks ..., Volume 28

International Correspondence Schools - Correspondence schools and courses - 1905
...France, 1.2 to 1.33; of Belgium, 1.27 to 1.3. The most prominent kinds are the following: 1374. 3. Caking Coal. A bituminous coal which softens and becomes...the softened mass, are driven off, and a coherent, grayish-black, cellular, or fritted mass (coke) is left. Amount of coke left (or part not volatile)...
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