National Library Week begins Monday, and the Knoxville and Pella Public Libraries are holding book sale fundraisers this weekend. Today is the final day of the Friends of the Knoxville Public Library Book Sale. The sale is a fundraiser hosted by the friends of the library to raise money for materials and programs. Books and movies will be available for $1 each and come from donations from the community and library inventory. The sale will take place at the Knoxville Public Library from 10am to noon Saturday. Also, the Friends of the Pella Public Library is holding their annual book sale this weekend as well. The sale is held in the library meeting room and customers may take as many books as they wish for a donation of their choice.