And a little more about the Edwards Award, from the YALSA website.
"Author" may be an individual or a co-author. The author must be living at the time of the nomination. In the case of co-authors, one must be living. If an author continues to write books of interest and appeal to young adults, then he or she may receive the award more than once as warranted, as long as it is not more frequently than every six years.
"Book or books" indicates either a title or titles written specifically for young adults, or those titles written for adults, which continue to be requested and read by young adults. The title or titles must be in-print at the time of nomination. Only those titles of an author's work which meet the criteria of the award will be cited.
"Over a period of time" means that the book or books must have been published in the United States no less than five years prior to the first meeting of the current Margaret A. Edwards Award Committee at the Midwinter Meeting. The five year period is stipulated so that the book or books have had enough time to filter down, i.e., reach a wide level of distribution, and to be accepted by young adults.
"Continues to illuminate their experiences and emotions" means that the book or books have become a literary cornerstone for young adults.
As you can see, the author must be living at the time of nomination; and that an author may receiver the award more than once.
Also, the books must have been published "no less than five years" prior to the first meeting of the Edwards Award.
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