Abraham Whitman
Illinois Civil War Muster and Descriptive Rolls Database (Illinois State Archives):
        Whitman, Abraham - SGT - Co I - 2 IL US L ART
         Residence, Joliet, Will Co, IL; Join, 01Oct1861-Joliet; Age, 25; Born, Canada
         Height, 5'10"; Hair, dark; Eyes, gray; Complexion, light; Single; Boatman
        
American Civil War Soldiers (ancestry.com)
      
Civil War Soldiers & Sailors System Search Detail (National Park Service):
        
National Graves Registration Database (Sons of Union Veterans of the Civil War):
      
Will County Illinois USGenWeb Necrologist Reports (© 2002 The ILGenWeb Project All Rights Reserved):

Headstone Reading,

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