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A manuscript was published about 1967 called "DABY-DORBY DATA", covering all variants of Derby/Darby (i.e., Daby thru Dorby), including DARBYSHIRE and BODURTHA, which somehow became transformed into Darby). I found a copy in the Sutro Library in San Francisco, and it is listed in the microfilm catalogue of the genealogical library at Salt Lake. Neither source lists an author.
It is an extensive collection of information - over 350 pages of detail, with complete cross indexing (another 250 pages). The author has identified 24 distinct Darby/Derby lines (some probably connect farther back), including the prominent ones we've all come across, as well as more obscure lines, and hundreds of 'loose ends', complete with citations and bibliography.
Does anyone know who the author is/was? It is a shame that such a helpful and remarkable achievement goes completely unattributed.