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Did he have an address in Marshalltown? I think that may be him. In the Soldiers and Sailors Sytem there is a W C Kimberly from the 1st Iowa Cav. His name is written in a 1907 copy of The Lyon Campaign by Ware. He wrote it was a gift from his daughter Anna Maude.
I could scan it if you are interested, maybe you can decipher it.
Thanks,