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- 84600286 contributor B4838323.
- 84600286 created "1985.".
- 84600286 date "1985".
- 84600286 date "1985.".
- 84600286 dateCopyrighted "1985.".
- 84600286 description "Includes bibliographical references.".
- 84600286 extent "23 p. :".
- 84600286 isPartOf "Information circular (United States. Bureau of Mines) ; 9021.".
- 84600286 isPartOf "Information circular ; 9021".
- 84600286 issued "1985".
- 84600286 issued "1985.".
- 84600286 language "eng".
- 84600286 publisher "Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines,".
- 84600286 subject "622 s 622/.8 19".
- 84600286 subject "Mine communication systems.".
- 84600286 subject "Modems.".
- 84600286 subject "TN295 .U4 no. 9021 TN344".
- 84600286 title "A low-cost FSK modem network for polled communication systems / by Richard A. Watson.".
- 84600286 type "text".