The Friends of the Mattapoisett Library’s Harbor Days book sale will open with a members-only preview on Wednesday, July 13, from 6 until 8 p.m. at the library, 7 Barstow St.

Friends will be on hand to sign people up for memberships before they shop the sale.

The sale will continue Thursday and Friday, July 14 and 15, from 10 a.m. until 4 p.m., and on Saturday, from 10 a.m. until 2 p.m. Shop early and shop often as tables will be restocked as space allows.

The Friends of the Mattapoisett Library is a nonprofit that provides a number of museum passes, supports the summer children’s programs and provides the library and its staff with wants and needs as they arise. Funding comes from  membership fees and book sales.