Manifold writing

a process or method by which several copies, as of a letter, are simultaneously made, sheets of coloring paper being infolded with thin sheets of plain paper upon which the marks made by a stylus or a type-writer are transferred; writing several copies of a document at once by use of carbon paper or the like.

See also: Manifold

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
But the "fortunate vagueness" Smith cites approvingly is not how Niebhur's manifold writings, notably The Irony of American History, might best serve as a contemporary pinprick.