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Heckenbach Alan J, Kegley J.Colby, . (1970). Approach to precalculus mathematics. : .
Heckenbach Alan J, Kegley J.Colby, . 1970. Approach to precalculus mathematics. : .
Heckenbach Alan J, Kegley J.Colby, . Approach to precalculus mathematics. : . 1970.