OR Serial 125 Page 1029 UNION AUTHORITIEs is also cataloged as OR Series 3 - Volume 4, page 1029
Series 3 - Volume 4, can also be found as Serial 125, which indicates the consecutive numbered Volume found in the records
Serial 125 contains 1290 pages
I use the two sources interchangeably in my reviews as Ohio can only be searched in total, but, individual parts cannot be searched, scanned, saved, transmitted, etc.
However, Cornell can be searched by individual volumes [Serials], but not copied
If I know the time frame and general geographic area, I begin my search using Cornell. If then, I wish to copy text, I then refer to Ohio.
If I want to conduct a Catholic search of the whole document, I start with Ohio. Depending on the length of what I find, I might double check with Cornell before copying.