๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

COAL MINED IN 1915


Book ID
114961956
Publisher
School Science and Mathematics Association
Year
1917
Tongue
English
Weight
51 KB
Volume
17
Category
Article
ISSN
0036-6803

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PREVIOUS tests on bond clays by the bureau had determined that American clays can be used successfully in graphite crucible manufacture and service. The next step was to determine the value of American graphites as compared with the foreign. The final tests were carried out at the plant of the Detro

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โœ Harry E. Tufft ๐Ÿ“‚ Article ๐Ÿ“… 1923 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 102 KB

DATA were obtained by the writer from a number of the large coal-mine operators in Illinois, on the consumption and cost of timber used in their mines and the quality of the timber now being used as compared with former years. The average cost for props in the longwall district has advanced from 0.