The Overflow was the Upjohn sales magazine from 1918 to 1961. It appears to have been a freewheeling little publication. Copies were bound as shown below. Early years of bound copies even had the salesman's name on the front cover.

Here is a full copy of the December 1924 Overflow issue.

Here is a full copy of the June 1951 Overflow issue. It contains photos of many significant company buildings built before 1951.