?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=Patricia&rft.aulast=Hatch&rft.au=Hatch%2C+Patricia&rft.title=Preconference%3A+MARC+21+Holdings&rft.date=4+June+2006&rft.genre=proceeding