by Robert Sliverberg; illustrated by Leonard Everett Fisher by Robert Irving ; illustrated by Leonard Everett Fisher by Robert C. Suggs. Illustrated by Leonard Everett Fisher. by John Foster; illustrated by Leonard Everett Fisher by Martin Gaedner;Illustrated by Leonard Everett Fisher by Geoffrey Household; illustrated by Leonard Everett Fisher Richard B. Morris; illustrated by Leonard Everett Fisher by Phil Ault； Illustrated by Leonard Everett Fisher Jeanette Eaton; illustrated by Leonard Everett Fisher Julian May; illustrated by Leonard Everett Fisher