PT  - JOURNAL ARTICLE
AU  - Chris Elfring
TI  - Land productivity and agricultural technology
DP  - 1983 Jan 01
TA  - Journal of Soil and Water Conservation
PG  - 7--9
VI  - 38
IP  - 1
4099  - http://www.jswconline.org/content/38/1/7.short
4100  - http://www.jswconline.org/content/38/1/7.full