The J. R. R. Tolkien Companion and Guide

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The J. R. R. Tolkien Companion and Guide by Wayne G. Hammond and Christina Scull, following their 2005 The Lord of the Rings: A Reader's Companion is a two volume work of reference on J. R. R. Tolkien and Tolkien studies.
Volume 1 "Reader's Guide" has information on people, places, organisations, biographical topics, literary topics, and writings by Tolkien.
Volume 2 "Chronology" presents an extraordinarily detailed chronology of Tolkien's life on 800 pages.