The Tennessee Militia Record Book and James Thompson Gamble Account Book, 1840-1885, contains records of both the 20th Regiment of the Blount County branch of the Tennessee Militia and of a merchant in Maryville.

The first half of the ledger book notes the division of the Blount County militia members into regiments, battalions, and companies based on geographic location. The Rules of Decorum for members of the battalion are also included. The bulk of this section of the ledger book, however, deals with the records of the Battalion Court Martials. Beginning on June 14, 1840 and ending on November 23, 1854, this portion of the book details meeting attendance and fines for missed meetings, appeals brought before the court, status reports on recruits ruled unfit for duty, and other militia business.

The second half of the book served as the account book for James Thompson Gamble of Maryville from 1870 through 1885. In this book, Gamble recorded wages earned, accounts owed, and accounts paid.