- Index to Arkansas' World War I soldiers, compiled by Desmond Walls Allen
- Arkansas History Commission county records on microfilm, by R.P. Baker
- Roads, old trails, traces and historical places of Arkansas, Michael A. Hedges
- Index to Arkansas' World War I African American soldiers, compiled by Desmond Walls Allen
- Tax records, 1838-1846, 1848, 1851, 1853-1854, 1856-1858, 1860, 1867, Union County, Arkansas
- Publications of the Arkansas Historical Association, edited by John Hugh Reynolds