Advanced development of a pressurized ash agglomerating fluidized-bed coal gasification system. Quarterly progress report, April 1-June 30, 1982, report, October 21, 1982; (https://digital.library.unt.edu/ark:/67531/metadc1058542/m1/2/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .