"Coffee Stains": How to Remove the Blots Quickly and Easily
http://www.stc.org/ConfProceed/1993/PDFs/Pg449.pdf

Houser, Barbara J.
STC Proceedings
1993

Abstract:

Trainers and others in the professional development field have a dual mission (among other responsibilities): to identify written 'coffee stains' and, equally important, to find and use as many effective approaches as possible to get the word out to the largest number of users.