?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.isbn=92-9090-611+1&rft.date=2005&rft.btitle=Watershed+Management+Challenges+Improving+Productivity%2C+Resources+and+Livelihoods+&rft.tpages=336&rft.genre=book