Pocket Part is best described as what?

• A. A calendar card
• B. An annual supplementary volume
• C. A digital update
• D. A paperback supplement inserted in a book through a slit in its back cover; usually includes textual, case, or statutory references keyed to the original publication

Answer: (D)

Pocket parts are the old-style, physical updates publishers add to a bound volume. They are small paperback supplements slipped into a pocket created by a slit in the back cover, designed to keep the original book current. The updates typically include textual material, new cases, or statutory references that map to the content of the original publication, so readers can locate the new information in context. This is distinct from a calendar card, an entire separate annual volume, or a digital update, since it is a physical insert tied to the specific book and page references.