"River of Mail" is a nine-minute video produced by the Post Office Department in the late 1960s to teach the public about mail processing methods used during the 1960s and early 1970s. Video courtesy of the United States Postal Service. https://postalmuseum.si.edu/research-articles/flashing-across-the-country/other-mr-zip-appearances
Video Duration:
9 min 14 sec
YouTube Keywords:
Smithsonian "postal museum" "National Postal Museum" stamps philately post office history