Abstract: A label dispensing sheet for incorporation within a book such as a telephone directory, dictionary or the like, includes a facing sheet of heavy paper stock releasably secured to a relatively thin backing sheet or liner by a pressure sensitive adhesive and containing a series of indicia bearing labels or tabs adapted to be applied to the pages of the book to designate the various alphabetical headings, sub-headings, categories or divisions thereof. The facing sheet and liner have overlying, extended edges for binding the label dispensing sheet proper within the book with corresponding portions of these extended edges being die cut and perforated, respectively, to form a lock and release construction holding the sheet securely in place in the book while permitting its ready removal therefrom during tab assembly to the book pages.