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Find old postcards, letters, and envelopes. A searchable database of old envelopes and postcards gathered from postal history collections. Old envelopes and postcards can reveal an immigrant ancestor's place of origin, a family's migration after their arrival, or the location of siblings.
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From the GENUKI web site.
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Successful Genealogical Correspondence and Travel to Germany
By Friedrich R. Wollmersh
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ThoughtCo - Postal and Traditional State Abbreviations Reference Guide
Both the postal and the traditional abbreviations for U.S. states.