GoogleBooks has the complete 1865 Army Register online. Compiled by the Adjutant-General, this reference volume lists all staff (by corps) and line (by regiment) officers of the Regular Army along with other ranks/commands to which they were assigned and the date they entered service.

Originally published by the US Government Printing Office (1865), this book was digitized from a copy at the University of Michigan on 10 October 2006. Go Wolverines.

With a quick check, complete volumes for 1848, 1850, 1853, 1864 and 1880 were also found, but other editions--like that for 1910--are blocked as if copyrighted (which of course they couldn't be).

Poor, confused GoogleBooks.

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