David K Howse1, Paul J Bracke1,2 and Samuel M Keim3
1
Arizona Health Sciences Library, 1501 North Campbell Avenue, P.O. Box 245079, Tucson, AZ 85724-5079, USA
2
Purdue University Libraries, 504 West State Street, West Lafayette, IN 47907-2058, USA
3
Department of Emergency Medicine, University of Arizona College of Medicine, P.O. Box 245057, Tucson, AZ 85724-5057, USA