1
Ruel C Terry: Methods of fluidized production of coal in situ. In Situ Technology, June 6, 1978: US04093025 (246 worldwide citation)

A method of producing combustible gases, synthetic crude oils, coal chemicals and heat from coal in situ utilizes the combined teachings of in situ gasification, liquefaction and pyrolysis.


2
Ruel C Terry: Methods of fluidized production of coal in situ. In Situ Technology, May 16, 1978: US04089372 (229 worldwide citation)

A method of producing combustible gases, synthetic crude oils, coal chemicals and heat from coal in situ utilizes the combined teachings of in situ gasification, liquefaction and pyrolysis.


3
Ruel C Terry: Methods of fluidized production of coal in situ. In Situ Technology, January 24, 1978: US04069868 (163 worldwide citation)

A method of producing combustible gases, synthetic crude oils, coal chemicals and heat from coal in situ utilizes the combined teachings of in situ gasification, liquefaction and pyrolysis in separated coal blocks.


4
Ruel C Terry: Methods of fluidized production of coal in situ. In Situ Technology, Gary M Polumbus, November 22, 1977: US04059151 (4 worldwide citation)

A method of producing combustible gases, synthetic crude oils, coal chemicals and heat from coal in situ utilizes the combined teachings of in situ gasification, liquefaction and pyrolysis in separated coal blocks.