The collection consists of 624 cuneiform tablets (dating from circa 3100-539 BCE), and some ancient clay objects. Accompanying these are some twentieth century casts, and a collection of catalogs of the collection, articles about various parts, especially Plimpton 322, and correspondence about the tablets, including a number of letters, mostly from Edgar J. Banks, to George A. Plimpton, and others about tablets now in the Columbia collection.