The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 5
The level of technical mastery over the environment attained by these peoples of the New World was roughly equivalent to that attained by the ancient Mesopotamians and Egyptians some 4,000 years earlier .
The level of technical mastery over the environment attained by these peoples of the New World was roughly equivalent to that attained by the ancient Mesopotamians and Egyptians some 4,000 years earlier .
Page 136
WORLD COAL RESERVES COAL : 4. Coal Mining and Production COAL MINING PROCEDURES. Uses of Various Coals . Although all coals may be burned to generate heat or power , the differ- ences between them in composition and proper- ties are ...
WORLD COAL RESERVES COAL : 4. Coal Mining and Production COAL MINING PROCEDURES. Uses of Various Coals . Although all coals may be burned to generate heat or power , the differ- ences between them in composition and proper- ties are ...
Page 630
FOREST CONSERVATION Since man first began to convert forest lands into permanent croplands , he has reduced the area of world forests by about one half . In the United States , for example , it is estimated that ...
FOREST CONSERVATION Since man first began to convert forest lands into permanent croplands , he has reduced the area of world forests by about one half . In the United States , for example , it is estimated that ...
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