My favorite site for primary source material is the US Army Military History Institute, Carlisle Barracks. At the moment I cannot connect to their site.
Here's some info which I would assume you already have access.
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1st Tennessee Cavalry Regiment, "History of the First Regiment of Tennessee Volunteer Cavalry in the Great War of the Rebellion, with the Armies of the Ohio and Cumberland, under Generals Morgan, Rosecrans, Thomas, Stanley, and Wilson, 1862-1865," by W. R. Carter, Sergeant of Company C. Originally published in 1896 by the Gaut-Odgen Publishing Company, Knoxville, Tennessee, this unit was originally mustered in as the 4th Tennessee Infantry until it was reorganized in 1862 as the 1st Tennessee Cavalry. They were commanded by Colonels Robert Johnson, who was a son of future U.S. President, Andrew Johnson, and later James P. Brownlow. They participated in such engagements as the Tullahoma Campaign, Wheeler's Raid, Mossy Creek, Franklin, Nashville and the Campaign for Atlanta. An original copy may be hard to locate, however it was reprinted in 1992, by Overmountain Press, Johnson City, Tennessee, 351 pages, with photos, and roster, costs around
$ 25.00.
Read about Harrison L. Belk, Member of Company A, 1st Tennessee Mounted Volunteers (Union), (owned by R.A. Mosocco, owner of this website, for your personal viewing)
2nd Tennessee Cavalry Regiment, "Hancock's Diary; or A History of the Second Tennessee Cavalry," by R. R. Hancock. Published in 1887 at Nashville, Tennessee, this book may prove hard to locate.
http://www.mosocco.com/tennessee.html
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These folks are listed as knowledgeable of the units referred by
Carol Botteron [botteron@alum.mit.edu] in her CW Units files at:
http://sunsite.utk.edu/civil-war/unit3.html
Have no ides if their addresses are current
2nd Tenn. Vol. Cavalry (USA) tenc@aol.com (Nancy C Nelson)
2nd (4th) TN Cav. Vols, 2nd Reg.,Co.M Z_NEWMANJC@ccsvax.sfasu.edu
3rd Tenn. Infantry (USA) culleoka4gen@comcast.net (Nancy)
3rd Tenn. Mtd. Inf. Co A, H (USA) ralphinla@earthlink.net (Ralph Clark)
5th Tenn. Infantry Regt., USA avonlunz@comcast.net (Robert von Lunz)
5th Tenn. Mounted Inf. Co. H (USA) 1864 cori@mcm.hp.com
6th Tenn. Infantry (USA) culleoka4gen@comcast.net (Nancy)