In November 2015 I came across a chronological list of Upjohn employees and retirees from 1897 to 1974, contained in two large binders. This was the official list used by Personnel in the days before computers. After 1974, information about employees and retirees was computerized.

The list has been scanned and is available here in pdf format. I had to split it up into 21 separate files, as shown below. The employee order is by start date. I've also shown the official employee numbers in the links below. The retiree list order is by retirement date.