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Characteristics of ultrasonic ranging sensors in an underground environment /
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Format: | Book |
Language: | English |
Published: |
Washington, DC :
U.S. Dept. of the Interior, Bureau of Mines,
1992.
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Series: | Report of investigations (United States. Bureau of Mines) ;
9452. |
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Physical Description: | ii, 39 p. : ill. |
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