2837.     ---------------.  [ROBERTS, G., AND SCHULTZ, P. R.]  Liquid Fuels From Coal and Oil Shale.  Petrol. Refiner, vol. 29, No. 1, 1950, pp. 104-108.

        As a result of an economic study, it is shown that, at present, liquid fuels from oil shale and coal cannot compete with those derived from crude petroleum.  Natural gas as a raw material may or may not be competitive, depending on the relative locations of raw-material supply and product markets.