Plant succesion and grazing capacity on clay soils in southern New Mexico

von Campbell, R. S.
Veröffentlicht in Journal of agricultural research ; 43 (1932)

Technology indicators based on patent data : the case of catalytic converters ; phase I report: desing and demonstration

von Campbell, R. S.
Veröffentlicht 1979

Technology indicators based on patent data : three case studies ; phase II report: development and application of indicators

von Campbell, R. S.
Veröffentlicht 1984

Patent analysis as a technology forecasting tool : presented at the Chemical Marketing Research Association Fall Conference, Atlantic City, NJ, September 18 - 21, 1983

von Ashton, W. B.
Veröffentlicht 1983

Defining and alleviating constraints in the dry tropical beef industry in the 1980's : Seminar

Veröffentlicht 1980