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Carbonizing properties and constitution of washed and unwashed coal from Mary Lee bed, Flat Top, Jefferson County, Alabama
Carbonizing properties and constitution of no. 6 bed coal from West Frankfort, Franklin county, Illinois
Carbonizing properties and petrographic composition of washed and unwashed Lower and Upper Kittanning-bed coals from mines 72 and 73, Johnstown, Cambria County, Pa.