There can be different map codes on each sub-map that is part of the overall map.
For this discussion I am going to refer to the map code on the large state map on any given state map.
SOHIO used Rand Mc Nally maps from 1924-1926, 1930-19-1985.
See the SOHIO-OH-Spreadsheet to see the code sequences Rand Mc Nally used in dating their maps.
Next lets look at the 1967 base code of 6714, the 67 again represents the last two digits of the year the map format was created.
In 1970 there are two version of the map, a 706714-7 and a 706714-8, the 70 before the base code is the last two digits of the year the map was produced, and the 7&8 after the base code are the two revisions for the map made in 1970.
From about 1918 to 1926 most of the Maps Rand Mc Nally produced were what I call "hard-cover" maps, the map is glued into a folder.
All of these so called "hard-cover" maps I have seen can be dated with a year date that is fairly easy to find either on the map cover or on the map itself.
The Sohio 1955 map code is 5-554903V-1 and the 1965 map code is 5-554903V-21.
Public pages are visible to everyone, and provide an introduction to the map collecting hobby. Links to an article from Legend #45 (the club’s newsletter) that looks at some of the types of maps collected: oil company issues, official state issues, auto club maps, those published in a single year, maps with scenic covers, maps for special events… Some of our members have their own websites, either as map dealers/traders, or simply to showcase favorite maps from their collection. If you’re just starting to collect oil company maps, or if you have a map that you are looking to sell on e Bay and are not sure if it’s rare, this page list the main oil companies, most of whose maps are quite commonly found. Dating maps from the big cartographers is remarkably easy – once you know the codes!
This page explains how they work, and should be checked by all vendors before trying to sell a map (please!
First, we have established a relationship with the Antique Automobile Club of America Museum in Hershey, PA which will allow us to have an exhibit of RMCA at the museum...
Read More This page provides links to (almost) everything that you might want to know about road maps, and how to start collecting them. to get a sneak peek at the benefits of becoming a Member of the RMCA. North American Major Oil Companies’ Map Master Lists.
As well as providing links to each of these issues, the Legend download page provides a summary of contents of all issues, which is useful if you are trying to find a specific article in one of the printed magazines.