The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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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 507
... natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure limestone . His product , called Roman cement , was widely used in concrete structures . Natural cements were made ...
... natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure limestone . His product , called Roman cement , was widely used in concrete structures . Natural cements were made ...
Page 618
... natural resources for future generations . The central purpose of most conservation activity is the perpetuation of ... Natural Resources ? The earth's sur- face provides the stage for human life , and the useful elements of the natural ...
... natural resources for future generations . The central purpose of most conservation activity is the perpetuation of ... Natural Resources ? The earth's sur- face provides the stage for human life , and the useful elements of the natural ...
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