Doty, Jean Slaughter. Dark Horse. NY: Morrow 1983. 122p, several ills. by Dorothy Haskell Chhuy. Fine hardcover in very good d.j. ** No edition statement but the printing code numbers start with 1. "Reinforced edition" noted on jacket. ** Girl tries to reform a truly dangerous show jumper. One of the author's tough-minded young adult novels about the horse show world. Scarce in this condition.