The back room at Newton Public Library was full of boxes and stacks of books Wednesday morning, as volunteers sorted through hundreds of books for the library's upcoming book sale.

The semi-annual sale, held in spring and fall each year, is organized by the Friends of the Newton Public Library group and provides additional funds to support the library's mission. It takes quite a bit of work to prepare for the sales, and Friends member Carol Heinel is grateful for the help from all the organization's volunteers.

"We sort and sort and sort books," she said with a laugh. "... If we didn't have those volunteers, it would be a long day of setting up."

The sale kicks off at 9 a.m. Friday and goes through 5:45 p.m., continuing on Saturday from 9 a.m.-1 p.m. A special members only pre-sale runs from 6-8 p.m. today.

A range of genres will be available at the sale, from children's, to cookbooks, to crafts, to fiction. The books available for purchase are ones that have either been taken out of circulation, or donated by patrons.

Prices for the books are $1 for hardcover and trade size books; $.50 for paperbacks; $3 for coffee table books; by donation for movies and children's books; and newer books as marked.

All the money made from the book sale is given back to the library and helps the library to purchase new materials. In the past, funds raised by the sale helped the library to purchase popular TV programs such as "Downton Abbey" and "Call the Midwife."

"Everything goes back to the library," Heinel said of the sale.

The Friends of the Newton Public Library group has about 100 members but is always open for others to join, Heinel said. To join the Friends of the Newton Public Library group, ask at the library's front desk. Donations also will be accepted throughout the year for the next sale.