The Margaret A. Edwards Award, established in 1988, honors an author, as well as a specific body of his or her work, for significant and lasting contribution to young adult literature. The annual award is administered by YALSA (Young Adult Literacy Services Association )and sponsored by School Library Journal magazine. It recognizes an author's work in helping adolescents become aware of themselves and addressing questions about their role and importance in relationships, society, and in the world. The Edwards award celebrated its 25th anniversary in 2013.
~From YALSA website http://www.ala.org/yalsa/edwards
The year associated with each book is the year the author was honored for his or her bodies of work.