The Friends of the Castro Valley Library will hold an indoor book sale on Saturday and Sunday, August 27th and 28th. This sale will feature many categories of nonfiction books, including history, biography, cookbooks, reference- and textbooks, many Asian language books, and more.  The sale will also include science- and paranormal fiction, children’s books, DVD’s and music CD’s. Most books are $1 or less; children’s books are 25¢. Saturday hours are 10 a.m. to 3 p.m. Sunday ($4 bag day) hours are 1 p.m. to 4 p.m.  There will not be a member preview, but members may use the $2 coupon on their membership cards on Saturday.  Cash, checks, and credit/debit cards are accepted.  Masks are required in the library.  The Castro Valley Library is located at 3600 Norbridge Ave.  Proceeds pay for library programs and amenities that would not otherwise be available. For more information, please call 510-733-3285.