?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Cromie&rft.aufirst=Ruth+Louise&rft.au=Cromie%2C+Ruth+Louise&rft.degree=Doctoral&rft.tpages=411&rft.inst=UCL+(University+College+London)&rft.title=Development+of+an+avian+tuberculosis+vaccine+for+wildfowl&rft.date=1991