1980 - 1989 Delve into a diverse collection of thought-provoking articles and fascinating explorations spanning from 1980 to 1989. Read about topics ranging from geometry, algebra, and calculus to number theory, combinatorics, and more. Volume 25 (1989) Volume 24 (1988) Volume 23 (1987) Volume 22 (1986) Volume 21 (1985) Volume 20 (1984) Volume 19 (1983) Volume 18 (1982) Volume 17 (1981) Volume 16 (1980)