USED Acceptable Former Library Book Hardcover with Dust Jacket in mylar cover. It has normal library markings including cardholder/reference sticker and library call number on the spine. The dust jacket has no tears with some cover scuff/indents on the mylar cover.  Cardboard showing on corners as well as frayed edging due to age. Some pages inside may be folded or wrinkled. It has the school and/or library name blacked out with a marker or white blackout sticker on the page edges, cover, and inside. Reinforced with white or clear library tape on some inside pages and cover. Some tape residues on the cover from the mylar cover. It also has brownish spots and some brown type staining on pages and edges of book that is called "foxing" which is the term for when books age this happens to them.

From Google Search:

"Foxing is an age-related process of deterioration that causes spots and browning on old paper documents such as books,postage stamps, old paper money and certificates. The name is derived from the fox-like reddish-brown color of the stains, caused by the rust chemical ferric oxide which may be involved."