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Still other markings have been applied to stamps orletters to indicate special handling by the Post Office De-partment. Thus a small rectangle inclosing the words"Supplementary Mail" or the same words with a circular"town" postmark indicated that an extra fee had beenpaid by the sender to get the letter aboard an outgoingship after the regular mail had closed. Letters carried onthe Mississippi River packet boats often were canceledwith the name of the steamer or perhaps merely "WAY"—indicating the letter had been picked up along theway-or "SHIP" or "STEAM." Letters carried by stage-coaches carry cancellations of the "Central Overland,California & Pike's Peak Express" and others. "Pony Ex- |
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