For my research and for "Tolkien's Library. An annotated cheklist," I purchased Leeds Calendars (1920-1927) and Oxford Calendars (1926-1961). Very useful and interesting
There seem to be a handful of the Oxford calendars floating around for very reasonable prices - here's one example from the auspicious year of 1954 (including "a loosely inserted contemporaneous photograph of what appears to be a handsome undergraduate or graduate") --
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