The Encyclopedia Americana, Volume 7Grolier Incorporated, 1999 - Encyclopedias and dictionaries A thirty-volume encyclopedia covering important world events while providing major new treatments of selected topics in various academic fields. |
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Page 142
... natural gas sent their costs upward sharply . Under these conditions , interest in coal production and coal research ... natural gas resources began to be exploited rapidly . See also GAS , FUEL - Manufactured Gas and History of the Gas ...
... natural gas sent their costs upward sharply . Under these conditions , interest in coal production and coal research ... natural gas resources began to be exploited rapidly . See also GAS , FUEL - Manufactured Gas and History of the Gas ...
Page 625
CONSERVATION : An Overview CONSERVATION : Sustaining Natural Resources CONSERVATION : Sustaining Natural Resources. tal problems . The federal government had proved too weak to enforce the new policies , and local officials had little ...
CONSERVATION : An Overview CONSERVATION : Sustaining Natural Resources CONSERVATION : Sustaining Natural Resources. tal problems . The federal government had proved too weak to enforce the new policies , and local officials had little ...
Page 626
... Natural Resources For much of its history , the conservation move- ment tended to view natural resources specifi- cally in terms of materials that have a direct eco- nomic value , such as minerals , timber , and fossil fuels . This ...
... Natural Resources For much of its history , the conservation move- ment tended to view natural resources specifi- cally in terms of materials that have a direct eco- nomic value , such as minerals , timber , and fossil fuels . This ...
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