Conditionally self-copying stationery

A pad of stationery for hand-written information, said pad including a plurality of stacked writing sheets each having a top surface and a bottom surface, said pad comprising a selectably-insertable copy sheet haveing first and second faces, said top surface of said each of said plurality of writing sheets comprising a carbon front coating, said bottom surface of said each of said plurality of writing sheets comprising neither a carbon front coating nor a carbon back coating, said second face of said copy sheet comprising neither a carbon front coating nor a carbon back coating, and said first face of said copy sheet comprising a carbon back coating, such that, with said copy sheet inserted with said first face uppermost between an upper one of an adjacent pair of said plurality of writing sheets and a lower one of said adjacent pair of said plurality of writing sheets, no record is producible on said lower one of said adjacent pair of said plurality of writing sheets in consequence of writing pressure upon said upper one of said adjacent pair of said plurality of writing sheets, and such that, with said copy sheet inserted between said lower and upper ones of said adjacent pair of writing sheets with said second face uppermost, a record is producible upon said lower one of said adjacent pair of writing sheets in consequence of writing pressure upon said upper one of said adjacent pair of writing sheets, said copy sheet including writing guidelines, visible through the upper ones of said adjacent pair of writing sheets, upon said first face and upon said second face thereof.