First session Mexico, D.F., Mexico 24-29 July 1961
Second session Ottawa, Canada 17-22 July 1963
Third session Washington, D.C., USA 18-22 October 1965
Fourth session Mexico, D.F., Mexico 2-7 October 1967
Fifth session Ottawa, Canada 15-20 September 1969
Sixth session Washington, D.C., USA 27-31 March 1972
Seventh session Mexico, D.F., Mexico 4-8 February 1974
Eighth session Ottawa, Canada 23-27 February 1976
Ninth session San Juan, Puerto Rico, USA 13-17 February 1978
Tenth session Pátzcuaro, Mich., Mexico 18-22 February 1980
Eleventh session Victoria, B.C., Canada 16-19 February 1982
Twelfth session El Paso, Texas, USA 21-24 February 1984
Thirteenth session Chetumal, Quintana Roo, Mexico 3-7 February 1986
Fourteenth session Sault Ste. Marie, Ontario, Canada 14-17 October 1987
Fifteenth session San Diego, California, USA 6-9 February 1990
Sixteenth session Cancun, Mexico 10-14 February 1992
Seventeenth session Jasper (Alberta), Canada 26-30 September 1994
Eighteenth session Asheville (North Carolina), USA 18-22 November 1996
Nineteenth session Villahermosa, Mexico 16-20 November 1998
Twentieth session St. Andrews, New Brunswick, Canada 12-16 June 2000
Twenty-first session Kailua-Kona, Hawaii, USA 22-26 October 2002
