1. Converting Organic Wastes to Oil, a Replishable Energy Source;Appell;US Bureau of Mines, RI 7560,1971
2. Conversion of Cellulosic Wastes to Oil;Appell;US Bureau of Mines, RI 8013,1975
3. Effect of pressure, temperature, pH, and carbon monoxide on oil yields from cellulose liquefaction
4. Direct Liquefaction of Biomass, Final Report and Summary of Effort 1977–1983;Davis;Lawrence Berkeley Laboratory, LBL-16243,1983
5. Bench Scale Research in Biomass Direct Liquefaction;Elliott,1982