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How Did We Find Out is a 12-book series with 12 primary works first released in 1973 with contributions by Isaac Asimov.
1973 • 54 pages
1973 • 64 pages
1975 • 64 pages
1976 • 64 pages
1976 • 62 pages
1978 • 2 Readers • 80 pages
1978 • 54 pages
1981 • 61 pages
1985 • 64 pages
1987 • 63 pages
1988 • 64 pages
1989 • 63 pages
