TY  - GEN
AU  - Agricultural Communication Systems
TI  - How chemicals move through soil [electronic resource]
CY  - [Tucson]
KW  - SOILS - Audiovisual Materials
KW  - SOILS - Surveys
KW  - ADSORPTION
N1  - University of Arizona; VHS-PAL; 28:00 min; col
ER  -