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Dear Ms. Dougall,
Thank you for posting your follow-up request on History Hub!
To locate the specific dates of Federal employment by Alan H. Dougall, please search through the online version of the Official Registry of the Federal Government that was published biannually. We have preselected the registries for 1879 through 1905. Once you compile his employment dates, please contact the National Archives at St. Louis (RL-SL), P.O. Box 38757, St. Louis, MO 63138 for a copy of his Official Personnel File.
We hope this information is helpful. Best of luck with your family research!
[Information provided by Holly Rivet, RL-SL]