mail art and postcards
- What is mail art?
- PostSecret is a gallery of postcard-sized images posted anonymously to unveil a secret. Shared confessions in art form.
- postcard exhibit at the Smithsonian
- postcard archive
- vintage American postcards
- long list of postcard sites
- University of Delaware postcard collection
- What kind of things can I send through the mail? Some amazing experiments testing the delivery standards of the United States Postal Service. Everything from balloons to $20 bills in clear envelopes.
- US Postal Service guidelines
