The Encyclopedia Americana, Volume 7Grolier, 1988 - Encyclopedias and dictionaries |
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Results 1-3 of 80
Page 142
Producer gas , water gas , and other gases derived from coal were developed and used in the 19th and 20th centuries , but their role in commerce and industry became small after World War II when natural gas resources began to be ...
Producer gas , water gas , and other gases derived from coal were developed and used in the 19th and 20th centuries , but their role in commerce and industry became small after World War II when natural gas resources began to be ...
Page 618
The earth's sur- face provides the stage for human life , and the useful elements of the natural environment - the natural resources - provide the materials necessary for man to survive . At any given time and place , of course ...
The earth's sur- face provides the stage for human life , and the useful elements of the natural environment - the natural resources - provide the materials necessary for man to survive . At any given time and place , of course ...
Page 619
With the advance of science and technology , combined with the tremendous population growth and improving standards of living , there have been vast changes in man's appraisal of natural resources . Today , more than 75 minerals are ...
With the advance of science and technology , combined with the tremendous population growth and improving standards of living , there have been vast changes in man's appraisal of natural resources . Today , more than 75 minerals are ...
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