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- 28026212 alternative "Underground communication through earth strata.".
- 28026212 contributor B723129.
- 28026212 contributor B723130.
- 28026212 created "1928.".
- 28026212 date "1928".
- 28026212 date "1928.".
- 28026212 dateCopyrighted "1928.".
- 28026212 extent "iv, 60 p.".
- 28026212 issued "1928".
- 28026212 issued "1928.".
- 28026212 language "eng".
- 28026212 publisher "Washington, U.S. Govt. print. off.,".
- 28026212 subject "Coal mines and mining.".
- 28026212 subject "Mine rescue work.".
- 28026212 subject "Signals and signaling.".
- 28026212 subject "TN1 .U6 no. 433".
- 28026212 title "Experiments in underground communication through earth strata,".
- 28026212 type "text".