Plant protection agents in developing country agriculture [microform] : empirical evidence and methodogical aspects of productivity and user safety  /
Angehrn, Beda.
Eidgenössische Technische Hochschule Zürich.
Zürich : Swiss Federal Institute of Technology Zürich,
1996.
Diss. ETH No. 11938.
Thesis (doctoral) -- Swiss Federal Institute of Technology Zürich.
Includes bibliographical references.
Plants, Protection of.
Agriculture