I started collecting the sheet music back in 2004 when I realized that there's different pictures of singers on the cover.
I contacted the HOF and they sent me some info - at that time they said there were 11 variations.
Many years later, I was contacted by Tim Wiles - the Director of Research at the HOF. He had written in his book that he thought there was about 30 different copies. But, he only had about 22 listed. I supplied him with the missing names.
I have 28 in my possession - and am - according to him - missing one.
My last pickup - which I waited years to find - Lulu Beeson - a very popular Vaudeville singer - dancer.
Many believe that Sadie Jansel was the "first" printing of the music.
I've never seen anything to fully back that claim tho.