?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.isbn=0-85199-828-3+&rft.date=2005&rft.btitle=Natural+Resource+management+in+Agriculture%3A+Methods+for+Assessing+Economic+and+Environmental+Impacts.&rft.tpages=382&rft.genre=book