Belated THANKS to those responding -- Rick and George.
If there is a section on fold3 (or anywhere) with just the "Quarterly Returns of Deceased Soldiers" forms for regiments/units, it must be difficult to find. This kind of subject would hopefully be just as accessible as the CSRs.
I have used fold3 for several years and have never seen a Quarterly Return before. Just not sure why it is buried in one soldier's record when it holds so many names and so much information.
http://files.usgwarchives.net/la/state/military/wbts/units/cof25inf.txt
is useful. I have seen this site before -- not this page -- and suspect there may be other such pages for other states and regiments.
Again, thanks for the help.