Florence O. Bean, Bookbinding for beginners (1918)
“ It is desirable to tie the portfolio together on one side at least. For this purpose secure tape of harmonizing color and 3⁄8 or 1⁄2 inch in width. About 1⁄2 an inch from and parallel to the front edges cut a slit through both paper and newsboard of the same length as the width of the tape. (This needs to be done with a knife or, better yet, with a chisel.) Insert a piece of tape from 6 to 9 inches long in each slit and securely paste at least 1 inch to the inside of the newsboard, allowing the greater length to project from the outside. ”
