collections and institutions

The Electronic Museum of Mail Art
http://www.actlab.utexas.edu/emma

The Getty Research Institute Research Library
http://www.getty.edu/research/conducting_research

Kunsten Museum of Modern Art Aalborg
Mogens Otto Nielen Archive of Mail Art
http://mailartarchive.com/

The Museum of Modern Art Library
DADABASE
http://library.moma.org

Neues Museum Weserburg Bremen
http://www.nmwb.de/index_e.html

The Sackner Archive of Visual and Concrete Poetry
http://www.rediscov.com/sacknerarchives

Smithsonian Archives of American Art
Wallace Berman Papers
http://www.aaa.si.edu/collections/wallace-berman-papers-10771

John Evans Papers
http://www.aaa.si.edu/collections/john-evans-papers-16087

John Held Jr. Papers
http://www.aaa.si.edu/collections/john-held-jr-papers-7713

Lucy R. Lippard Papers
http://www.aaa.si.edu/collections/lucy-r-lippard-papers-7895

Samuel Wagstaff Papers
http://www.aaa.si.edu/collections/samuel-wagstaff-papers-6939

Ray Johnson Papers
http://www.aaa.si.edu/collections/ray-johnson-papers-6888

miscellaneous

Arte Correo en Argentina
http://www.vorticeargentina.com.ar/

Fluxus Portal
http://www.fluxus.org

Guy Bleus
http://www.mailart.be/

International Union of Mail Art
http://iuoma-network.ning.com/

Mail Art Forum
http://www.mail-art.de/

Umbrella
http://colophon.com/umbrella