Author:La Grange, CCDate:1965The purpose of this investigation was in the firs instance to determine what yields of low ash products could be expected from the duffs, such products to be suitable.Read more
Author:La Grange, CCDate:1968This memorandum contains tables and notes appended which represent information obtained from time to time during investigations concerned with possible production of coking coal from Witbank duffs and other products.Read more
