If you look at here:
Justice Society of America
and
https://comicvine.gamespot.com/jsa-c...ed/4050-18120/
You will see that it got collected into 4 tpb:
-
Power Girl - JSA #32, 39 + JSA: Classified #1–4 + Showcase #97–99 + Secret Origins vol. 2 #11
-
Power Girl: Power Trip - JSA: Classified #1-4 + Power Girl #1-12
-
JSA Classified: Honor Among Thieves - JSA: Classified #5-9
-
JSA Presents: Green Lantern - Green Lantern: Brightest Day + Blackest Night (one-shot) + JSA: Classified #25, #32–33
So indeed, you have a lot of issues uncollected:
-
The Fall & Rise of Vandal Savage (feat. Green Lantern) - #10-13
-
Double or Nothing (Wildcat / Stargirl) - #14-16
-
The Venom Connection (feat. Hourman) - #17-18
-
Skin Trade! (feat. Doctor Mid-Nite) - #19-20
-
never ending Batle of the Rann-Thanagar War (feat. Hawkman) - Hawkgirl #58 + #21 + Hawkgirl #59 + #22
-
Nightfall (feat. Doctor Mid-Nite) - #23-24
-
Fight Game (feat. Wild Cat) - #26-27
-
Problem Solved (feat. Jakeem Thunder and Thunderbolt) - #28
-
Mr. Horrific (feat. Mr Terrific) - #29-31
-
60 Minutes (feat. Hourman) - #34
-
Forward Through the Past (feat. Wildcat) - #35-37
-
Body And Soul (feat. Wildcat vs. Wildcat) - #38-39
-> there is enough material to do a few nice collections or to include those issues in a bigger omnibus:
- JSA Classified: Vendal Savage - #10-13
- JSA Classified: Wildcat - #14-16, 26-27, 35-39
- JSA Classified: Doctor Mid-Nite - #19-20, 23-24
- JSA Classified: The Rann-Thanagar War - #21-22 + Hawkgirl #58-59
- JSA Classified: Hourman - #17-18, 34
- JSA Classified: Mr. Terrific - #29-31
Would be left alone issue #28.