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:
See the Terra Candella commemorative Ex Postal Facto stampsheet
Harley participated in AARPEX, the Artistamp Artists Reunion and Exposition, in Seattle Washington, November 10, 2012. For more information about AARPEX: http://ctchew.com/aarpex.html
See the Terra Candella commemorative stampheets for AARPEX
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"
Secret Service Investigates Bush Stamp Art
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
Harley participated in two mailart events in Minden, Germany:
See the Terra Candella commemorative stampsheet and covers for the Mailart & Performance Festival "La Vie En Rose" in Minden, Germany, July 30 - August 2, 2009.
See the Terra Candella commemorative stamp sheet and cancels for Decentralized Networking
Congress (DNC) of Mailart in Minden, Germany, April
Harley attended Artistampex Artistamp Exposition + Bourse June 1 - 9, 1984 in London, Ontario, Canada.
See a Terra Candella commemorative stamp and first day cover for Artistampex.
Browse selected images from the Harley
Terra Candella Archive of mail art in the Special Collections
division of Oberlin College Library: http://dcollections.oberlin.edu/cdm/search/collection/mailart/searchterm/tc%201995/field/format/mode/all/conn/and/order/dated/page/1
Read a history of Harley's Terra Candella mail art archive