“Grids: Their Meaning and Use for Federal Designers” is a book based on a presentation given by Massimo Vignelli at a seminar for federal graphic designers at the Illinois Institute of Technology on November 10, 1976.
He covers the basics of grid design, then shows how grids were used in some of the projects that he worked on. It’s a nice little read. Hi-res scan of the entire book is available here.
Via Sean Wolcott