1. Chemical analysis of ecological materials;Allen,1974
2. Biogas production from crops and organic wastes. 1. Results of batch digestions;Badger;New Zealand J. Sci.,1979
3. Anaerobic digestion of dairy manure under mesophilic and thermophilic conditions;Converse;Trans ASEA,1977
4. Anaerobic digestion of farm animal wastes (dairy bull, swine and poultry);Gramms;Trans. ASAE,1971
5. Mechanical separation of manures and its adoption by farmers in England and Wales;Grundey,1979