Commercial corresponderce - Programmed instruction.

[NT 60487] Overview

[NT 60478] Works:	1 [NT 60520] works in 1 [NT 60521] publications in 1 [NT 60522] languages

[NT 60480] Titles

Better business letters : a self-instructional book to develop skill in writing [NT 59711] by: Silleck, Anne; Reid, James M. ([NT 1579] Language materials, printed)