Harley was a featured speaker at Ex Postal Facto at the San Francisco Main Library in February 2014: "Artistamps and Their Makers: Seeing the World in Miniature". Perforations, postmasters, and the particulars of stamp design were covered - moderator Jennie Hinchcliff spoke with Black Rock City Postmaster James Cline, artistamp makers Ginny Lloyd, James Felter and Harley of Terra Candella in a lively discussion.
You can also find the video of the discussion directly on YouTube:
For more information about Ex Postal Facto:
Harley's work was featured in "The Carbon Alternative" : The Arthur & Mata Jaffe Center for Book Arts, Boca Raton Florida
Harley's stamps shown in Stendhal Gallery: "Greetings from Dadaland:Fluxus, Mail Art and Rubber Stamps"
Harley's Ministry of Truth Stamps have been published in Axis of Evil: Perforated Praeter Naturam.
You can learn more about this book and it's companion
Secret Service Investigates Bush Stamp Art
Browse selected images from the Harley
Terra Candella Archive of mail art in the Special Collections
division of Oberlin College Library: