Herr, Ted, 1955- Problem solving strategies : crossing the river with dogs : and other mathematical adventures / Crossing the river with dogs Ted Herr, Ken Johnson. - Berkeley, Calif. : Key Curriculum Press, c1994. - vii, 486 p. : ill. ; 23 cm. ISBN: 1559530685 Subjects--Topical Terms: Problem solving.Mathematics. LC Class. No.: QA63 / .H37 1994 Dewey Class. No.: 510.76220