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- catalog contributor b1324680.
- catalog created "1972.".
- catalog date "1972".
- catalog date "1972.".
- catalog dateCopyrighted "1972.".
- catalog extent "xii, 231 p. :".
- catalog issued "1972".
- catalog issued "1972.".
- catalog language "eng".
- catalog publisher "Research Triangle Park, N. C. : Environmental Protection Agency, Office of Air Programs ; Springfield, Va. : distributed by National Technical Information Service,".
- catalog spatial "United States".
- catalog subject "Air Pollution Measurement.".
- catalog subject "Air Pollution United States Statistics.".
- catalog title "Air quality data for 1968 from the National Air Surveillance Networks and contributing state and local networks.".
- catalog type "text".