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1
Washing and coking tests of coal at the fuel-testing plant,..
United States congressional serial set ; serial set no. 5460;House document / 60th Congress, 2nd session. House ; no. 1060
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2
Washing and coking tests of coal and cupola tests of coke, ..
United States congressional serial set ; serial set no. 5304;House document / 60th Congress, 1st session. House ; no. 731