I am LSCC member so I have the journals. No clue if they are online; however if you are a member of the ANA, contact the library and borrow the 5 bound volumes OR ask them to zerox the info on 1861-O halves. If you are going to collect theses coins, you should join the club also.
All of the Gobrect Journals are available online on the Newman Numismatic Portal. This was discussed on another thread and I posted a link to the issue with the 1861-O die variety information(issue 94). And I believe someone posted the link to issue 97 that gave further information. Issue 94 is the one that contains the images of the diagnostics of the varieties. This is the link to that thread https://www.cointalk.com/threads/1861-o-half-dollar.281489/