QUICK BIBLIOGRAPHY SERIES MINIMUM TILLAGE 1974 1979 357 citations April 1980 NAL-BIBL.--80-10 Searched by Jayne T, MacLean Reference Branch National Agricultural Library (301) 344-3704 DATA BASE SEARCHED AGRICOLA LANGUAGES NONE Excluded Bibliographies in this series are derived from computerized on-line searches of selected data bases. Timeliness of the topic and evidence of extensive interest are selection criteria. Comprehensive subject coverage is not an objective; however, the citations provide a substantial recent resource for investigation of the subject. Each bibliography is updated or dropped after six months. Copies of this bibliography may be made for use or distribution without , prior approval. The inclusion or omission of a particular publication or citation may not be construed as endorsement or disapproval. To request a copy of a bibliography in this series, send the title, series- number, and a return addressed gummed label to: REFERENCE BRANCH TECHNICAL INFORMATION SYSTEMS SCIENCE AND EDUCATION ADMINISTRATION U. S. DEPARTMENT OF AGRICULTURE NATIONAL AGRICULTURAL LIBRARY BUILDING Beltsville, Md. 20705