Here are old covers of annual Reach's Guides and Spalding's Guides to Base Ball. These guides were quite popular in the 1920s and 1930s. They featured a few paragraphs and pictures for each major league team as well as a coverage of some minor leagues.
Reach Guide with Ray C. Kolp as #8 below:
And here is a collage including Ray Kolp in the upper right corner as a St. Louis Brown from Spalding's Official Base Ball Guide of 1922:
Ray Kolp's two "off years" in mid-career with the St. Paul Millers minor league team was covered in the Reach Guides for 1925 and 1926:
This is the 1926 Saints team. Ray Kolp and most of his teammates signed a baseball pictured on the Ray Kolp Baseballs page.
And here is Ray Kolp in the center as a Cincinnati Red from Spalding's Official Base Ball Guide of 1929 showing Reds from 1928:
And here is the next Spalding Guide showing the Red stars for 1929:
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