ACERTIJOS: JOURNAL OF RECREATIONAL MATHEMATICS EN INGLES

JRM VOLUME 21, NUMBER 3, 1989

JRM VOLUME 21, NUMBER 4, 1989

JRM VOLUME 22, NUMBER 2, 1990

JRM VOLUME 22, NUMBER 3, 1990

JRM VOLUME 22, NUMBER 4, 1990

JRM VOLUME 23, NUMBER 1, 1991