Apparently these are Volumes and Sections and Pages.

Womack, Private - 	I, 20
Womack, A J 		I, 30
Womack, B R		I, 10
Womack George W 	III, I, 4,5
Womack, J F 		I, 53
Womack, J J 		I, 20
Womack, Mark S		IV, 2
Womack, Sidney		I, 30 
Womack, W A		II, 5

Appears to be breaking down a little further

Listing mentions Corporal A J Womack, Chickamauga Campaign
Chap XLII, page 541. 35th Infantry Regiment, Comp A. 
I 51 Vol 30 part 2
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Mention of some officers and Lieutenant Sidney Womack,
'They each discharged their duties with dignity and zeal.'
Chickmagua Campaign, Chap XLII. Page 121.
I 51 vol 30 part 2
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Mention: "The first pickett is at Bradford's, and then at the fork
from the old Liberty roadup to Mr Lee's is the third pickett.
On the other side of the Amite River from Henry Womack's up to
William's Bridge. Feb 16 1865, something about the number of
men and where stationed.I 101 Vol 48 part 1
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Marshall, Tuesday Evening, May 7, 1861
Mention of a J F Womack concerning raising of horses and money.
I 111 Vol 53, supplemental
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From the book "Prisoners of War and State"
Dec 26 1862, speaking of the treatment they receive at Camp Chase
Prison, and I would here add that the followign extracts are only
a counterpart of thousands of others of similar character that I
have read during the past few months.
			DB Tiffany
			Prison-Provost Mrshall-Examiner of Letters.

We get plenty to eat and are treated well by the officers.
			W A Womack [Kentucky]

Bill of fare at the Virginia House Dec 25, 1862.
Bean Soup, hog and corn, pork and hominy, roast beef, turkey, duck,
Shanghai chicken, oysters, apple dumplings, pound cakes, sweet
cakes, green peaches, peach pie, &c. IV 118 Vol 5
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Correspondence etc.
Fifth District - Report of Capt G W Womack, provost-marshall, 
Fifthe District, this date 14th instant, states that no actual 
progress in enrollment has been made. IV  125 Vol 4
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Index
Womack, Mark S, page 930
IV 128 Vol 2
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Correpondence about 5th Regiment mentions Capt Womack.
IV 128 vol 2
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Womack, B R mentioned, page 589 
I 10, Vol 10, Part 1
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A Private Womack, mentioned, page 718
I 29, Vol 20 Part 1
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Womack J J mentioned pages 713, 717
I 29, Vol 20 Part 1
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Waymack, George W - II 5
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Name: John Woimac 
Age: 35
29 Nov 1862 Mustered in.
Orig Record says enrtolled Nov 16th.
Enlistment Location: New Orleans - Private
Branch of Service: 10th U.S. Colored Heavy Artillery 
Orig record says Comp A, 1st Regt, LA Colored Art'y 
Estimated Birth Year: abt 1827  
Roll: M1818_185  
Enclosures: 20  
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Name: Alfred Wammack [also shown as Wommack]
Birth Location: Donalson, Tennessee  
Enlistment Date: 1863 
Enlistment Location: Nashville  
Branch of Service: 13th US Colored Infantry [Comp G]
From an Original:
Age 30, 5'10, hair black, complexion black, eyes black
Occupation farmer, enlistment Oct 10 1863  for 3 years
was present at battle of Nashville.
One records shows rank as Sergeant.
Another image shows Music, Comp G 13 Reg't US Colored Infantry
and that from Jan 28 to Mar 1865 was absent, sick in hosp,
at Nashville.