Perhaps you should try some spelling variations:
"oxford historical biogeography / oxford historical biogeography" » "oxford historical demography / oxford historical demography", "oxford pictorial biogeography / oxford pictorial biogeography", "foreword historical biogeography / foreword historical biogeography", "informed historical biogeography / informed historical biogeography"
"oxford historical topography / oxford historical topography" » "oxford historical ethnography / oxford historical ethnography", "oxford historical iconography / oxford historical iconography", "oxford historical demography / oxford historical demography", "oxford pictorial topography / oxford pictorial topography", "foreword historical topography / foreword historical topography", "informed historical topography / informed historical topography"
"oxford historical geography / oxford historical geography" » "oxford physical geography / oxford physical geography", "oxford pictorial geography / oxford pictorial geography", "foreword historical geography / foreword historical geography", "informed historical geography / informed historical geography"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oxford historical topography / oxford historical topography") OR ("oxford historical geography / oxford historical geography"))) OR ("oxford historical biogeography / oxford historical biogeography")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"oxford historical topography / oxford historical topography\") OR (\"oxford historical geography / oxford historical geography\"))) or (\"oxford historical biogeography / oxford historical biogeography\"))".
• Removing quotes may allow a broader search: (((( oxford historical topography / oxford historical topography ) OR ( oxford historical geography / oxford historical geography ))) or ( oxford historical biogeography / oxford historical biogeography )).
• Adding a wildcard symbol may retrieve word variants: (((("oxford historical topography / oxford historical topography") OR ("oxford historical geography / oxford historical geography"))) or ("oxford historical biogeography / oxford historical biogeography"))*.