Clubs and Organizations
Dental
1973 - American Dental Association (ADA)
http://www.ada.org
1973 - California Dental Association (CDA) 
http://www.cda.org
1974 - Contra Costa Dental Society (CCDDS)
http://www.ccdds.org
Aviation
1984 - Aircraft Owners and Pilots Association (AOPA)
Other
1973 - MENSA
For the study of current events. Influential national and international speakers
Fans of the 1980 movie, "Somewhere in Time", starring Christopher Reeve and Jane Seymour
- Planetary Society
http://www.aopa.org
1984- California Pilots Association (CPA)
http://www.calpilots.org
1984 - Mt. Diablo Pilots Association (MDPA)
http://www.mdpa.org
1985 - Experimental Aircraft Association (EAA)
"Membership of Mensa is open to persons who have attained a score within
the upper two percent of the general population on an approved intelligence
test that has been properly administered and supervised."
http://www.us.mensa.org
1974 - Commonwealth Club of California
are invited to speak at the club's weekly meetings in San Francisco.
http://www.commonwealthclub.org
1976 - American Coaster Enthusiasts (ACE) - Member #387
Dedicated to the promotion, support, and preservation of roller coasters.
http://www.aceonline.org
1980 - Planetary Society
Founded by Carl Sagan, THE PLANETARY SOCIETY, the world's largest
space-interest group, is dedicated to inspiring the public with the adventure
and mystery of
http://www.planetary.org
1985- International Network of Somewhere In Time Enthusiasts (INSITE)
ttp://www.somewhereintime/insite.htm
