The Encyclopedia Americana, Volume 7Grolier Incorporated, 1996 - Encyclopedias and dictionaries |
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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 507
Smeaton is credited with being the first to reestablish the use of hydraulic cement , which was the forerunner of natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure ...
Smeaton is credited with being the first to reestablish the use of hydraulic cement , which was the forerunner of natural cement . A patent was issued to James Parker of En- gland in 1796 for a natural cement made by burning impure ...
Page 625
The consequences and con- cerns stemming from major events , such as oil spills and efforts to protect natural areas , are peri- odically pushed off the federal government's agenda by economic and social issues .
The consequences and con- cerns stemming from major events , such as oil spills and efforts to protect natural areas , are peri- odically pushed off the federal government's agenda by economic and social issues .
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