“Radio Net – Music For Cross Country Broadcast Loops
Take part in a unique musical work: Call National Public Radio and whistle – your sound will multiply as it circles the country and will be aired by your local NPR member station”
Washington, D.C: National Public Radio, 1977 (01), 8,8×14 cm. Participatory event invitation card. Interesting mailed example addressed to John Perreault.
condition: Mailed. VG+.