David Norman Farming Systems Development and Soil Conservation - Delhi Daya Publishing House 2007 - 173p David Norman & Malcolm Douglas: Farming Systems Development and Soil Conservation. Delhi. Daya Publishing House, 2007. 81-7035-512-5 Rs. 450.00--(630.2NOR) ENGLISH ISBN: 81-7035-512-5 Dewey Class. No.: 630.2 / NOR