The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 133
Coal Mining and Plant Debris 133 Production Appearance of Kinds of Mines 137 137 Coal Seams 134 Mining Hazards 2. ... Apparently the plants partially decayed and then were covered , preserved , and ultimately compacted by the other ...
Coal Mining and Plant Debris 133 Production Appearance of Kinds of Mines 137 137 Coal Seams 134 Mining Hazards 2. ... Apparently the plants partially decayed and then were covered , preserved , and ultimately compacted by the other ...
Page 134
THE FORMATION OF COAL Coal is derived from the tissues of plants that flourished several hundred million years ago in swamps . As genera- tions of plants grew and died , their debris accumulated as peat until in many areas it was ...
THE FORMATION OF COAL Coal is derived from the tissues of plants that flourished several hundred million years ago in swamps . As genera- tions of plants grew and died , their debris accumulated as peat until in many areas it was ...
Page 231
COLEUS , kō'le - as , a genus of annual and peren- nial plants widely grown as house and garden plants . Coleus belongs to the mint family ( La- biatae ) and is native to Java and tropical Africa , although many species have become ...
COLEUS , kō'le - as , a genus of annual and peren- nial plants widely grown as house and garden plants . Coleus belongs to the mint family ( La- biatae ) and is native to Java and tropical Africa , although many species have become ...
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