The folder should then be stored horizontally in acid-free boxes or within shallow map drawers. Manuscripts with stable media should be stored as above, although in archival collections they are often stored for the convenience of the user, in folders in vertical document boxes. Encapsulated prints can be stored 10-15 together in an archivally stable folder. Newsprint and acidic materials should be isolated in storage by acid-free papers or encapsulated in polyester folders or pockets. Acid free or alkaline insert papers can be included in the pockets to absorb acids.
Hardcover books can be lined-up vertically on a shelf.
Softcover books, magazines and pamphlets can be stored in acid-free, phase boxes, vertical document boxes, etc. They should be kept separate from mounted photos. Mounted photos of like sizes can be stored face to face with neutral paper interleaving and buffered paper on the verso each of their mounts. Groups of photographs protected as in 1 and 2 above can be stored in boxes made with ANSI approved materials following a variety of formats, as long as the boxes are not over-stuffed. The photos should be arranged in groups of like-sizes to fit snugly but not tightly into the box.