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Any reason why Del Norte would not be listed in Skinner?
The various fancy cancel monographs contain what was known to the author and are a mere sampling of what was produced. Consider, there were 43,558 post offices on December 1, 1880, most of them 3rd and 4th class. Skinner/Eno is too early. Nor is it in Cole's Banknote cancel book, which does cover the correct era.