http://asa.calvin.edu/ASA/index_right.html
It doesn't appear to have been updated recently, and it doesn't seem to
have a "How to join ASA" section, but it'll give you some information about
the organization.
ASA's email addr is asa@newl.com. Generally they respond pretty quickly to
requests for information.
Perhaps someone else on the reflector has ASA's addr in Ipswich, MA...
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Bill Hamilton, Staff Research Engineer
Chassis and Vehicle Systems, GM R&D Center
Warren, MI
hamilton@predator.cs.gmr.com / whamilto@mich.com (home)