Need additional resources not available through CORE? Check out the Butte County Public Library Catalog. (You must have a public library card, and check out books through the public library).
California Learning Resource Network
"Your source for California standards-aligned electronic learning resource information and lessons." The CLRN Web Information Links (WIL) database is a collection of free primary source, secondary source, and reference web sites that are accessible though a standards based browse function or a search function.