The below query "recipe" will only work if your catalog uses the local subject headings "Adult Fiction" or "Adult Nonfiction" or "Adult Book".
Advanced Search:
MARC Tag - Tag - Equals - 690
MARC Tag - Data - Begins - adult
MARC Tag - Tag - Equals - 690
MARC Tag - Data - Matches - juvenile
BibRec - Title Status - Equals - a
