Baseball Magazine M113s & M114s

[Xabi]

I was wondering if anyone could tell me a bit about these poster-sized photo cards that were produced by Baseball Magazine? I was able to figure out what they are via online searches, but there doesn't seem to be a lot of information on them. I have in the M113s (the larger of the two): Christy Mathewson, Nap Lajoie, Ty Cobb, John McGraw, Hans (Honus) Wagner, Larry Doyle, and one of Walter Johnson's pitching arm (it's a horizontal of Johnson from the waist up with no shirt and his arm extended). The M114s I have are: Babe Ruth (batting in a Boston Red Sox uniform), Ross Young, Rogers Hornsby, Grover Cleveland Alexander, George Sisler, Tris Speaker, Frank Snyder, Ed. Roush, George Kelly, Arthur Nehf, E. Meusel, Frank Frisch, Dave Bancroft, Wilbur Cooper, Heinie Groh, and George Burns. Most of the photos list C. M. Conlon as the photographer and there are some tears and frayed edges (some are definitely in better shape than others). Just wondering what these are worth, what kind of market exists for these, and if there is an expert in the field of these M113s and M114s? Thanks a lot. Chris