Adam, here is some more information that will be of no use to you with your research. Esso is the phonetic pronunciation of S.O. and was the new name chosen for Standard Oil of New Jersey after the breakup of the Standard Oil monopoly. Esso was eventually renamed Exxon in 1973.
Interestingly enough, in addition to these baseball stamp quiz albums, Esso also published the Negro Motorist Green Book.
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