Steve,
Are you familiar with the publication Gridiron Greats? Two issues ago (#35) the staff writers put together a fairly comprehensive list of pre-1948 issues. It is a great resource for the football collector. The website is
www.gridirongreats.net
A couple issues to add to your list that I didn't see on your website would be 1928 Star Player Candy and the 1926 Spalding Sports Company of America.