Linda Carter fills her arms with books Thursday at the Friends of the Princeton Public Library’s used book sale. The Friends have added Third Thursday sale dates to its annual book sales. The sale is held at the library in the new Book Sale Room located at the back of the library, behind the fiction stacks. The next sale will be held from 2 to 8 p.m. Feb. 21. Proceeds from the sale go toward funding many special projects throughout the year as well as supplementing the library’s annual budget with collection, material and infrastructure infusions.