?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.isbn=9290664037&rft.date=1999&rft.btitle=GIS+analysis+of+cropping+systems%3A+proceedings+of+an+International+Workshop+on+Harmonization+of+Databases+for+GIS+Analysis+of+Cropping+Systems+in+the+Asia+Region%2C18-19+Aug+1997%2C+ICRISAT-Patancheru%2C+India&rft.genre=book