![]() ![]() This seems to have been used on all the company's folding maps, and possibly also those in book form. ![]() In one scheme, the letters JIHGFEDCBA represent the digits 1 to 9 and 0, so that HFD would be 357, indicating a publication date of March 1957. There was at least one scheme used, and perhaps a second. These letters represent numbers, which are the cartographic date, in the form (M)MYY. On all A–Z maps, there is a three or four letter code in one of the corners, often the one containing the key.
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