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Finally, the last digit of the code is the last digit of the year of issue.Diversified appeared to have started producing maps in 1962 and stopped production in the early 70's.
Here's an example: I have a 1964 Standard Oil map of Minnesota produced by Diversified. The 14 references Diversified's base map of Minnesota; the 2 suggests that the map is a second edition for the year of issue; and finally the 4 indicates that the year of issue is 1964.It was often, but not always in the bottom left or bottom right corner of the body of the map.If the code contains three digits, the first digit appears to reference the base map.The code will contain four, five or six digits, depending on the month and date.The codes are generally publication dates jumbled in a certain, consistent way that are often preceded by the letter C, although this is not always the case.
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Hope this info, confusing as it is, is helpful to you.