LaTeX: an Introduction
http://www.techscribe.co.uk/ta/latex-introduction.pdf

Unwalla, Mike
TechScribe
2006

Abstract:

LaTeX is a powerful typesetting system that is used for producing scientific and mathematical documents of high typographic quality. Unlike WYSIWYG tools such as FrameMaker and Word, it uses plain text files that contain formatting commands. It is big, open source, and used by many technical publishing companies. This article overviews LaTeX, and directs you to sources of information.