TY - BOOK AU - Duffy, Thomas M (Ed.) AU - Waller, Robert (Ed.) TI - Designing usable texts T2 - The educational technology series SN - 0-12-223260-7 PY - 1985/// CY - Orlando: PB - Academic Press, Inc. KW - English grammar KW - Information mapping KW - Editing KW - Authoring ER -