Bulletin no. 1 (June 1967)
Bulletin no. 11 (November 1970)
Bulletin no. 2 (December 1967)
Bulletin no. 12 (March 1971)
Bulletin no. 3 (March 1968)
Bulletin no. 13 (July 1971)
Bulletin no. 4 (June 1968)
Bulletin no. 14 (December 1971)
Bulletin no. 5 (September 1968)
Bulletin no. 15 (March 1972)
Bulletin no. 6 (February 1969)
Bulletin no. 16 (July 1972)
Bulletin no. 7 (June 1969)
Bulletin no. 17 (January 1972)
Bulletin no. 8 (October 1969)
Bulletin no. 18 (April 1973)
Bulletin no. 9 (March 1970)
Bulletin no. 19 (September 1973)
Bulletin no. 10 (June 1970)
Bulletin no. 20 (March 1974)
