The September 1973 issue of Radio Electronics had a 6 page article on Don Lancaster's TV Typewriter. The complete construction article was sold in a 24 page booklet that had to be ordered from Radio Electronics. The first 6 pages were a reprint of the article, the next 16 pages were more construction details, and the last 2 pages were corrections and errata.
Click on an image below to see a 200 dot per inch Acrobat PDF file. The files a between 250k and 1000k bytes in size. (I have 600 DPI TIFF files.)