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- 30026020 contributor B758954.
- 30026020 contributor B758955.
- 30026020 created "1929.".
- 30026020 date "1929".
- 30026020 date "1929.".
- 30026020 dateCopyrighted "1929.".
- 30026020 extent "ii, 40 p.".
- 30026020 issued "1929".
- 30026020 issued "1929.".
- 30026020 language "eng".
- 30026020 publisher "Washington, U.S. Govt. print. off.,".
- 30026020 subject "Fluorspar.".
- 30026020 subject "Ore-dressing.".
- 30026020 subject "TN1 .U6 no. 456".
- 30026020 title "Classification and tabling of difficult ores with particular attention to fluorspar,".
- 30026020 type "text".