Does anyone here know what technology or instrument was used to typeset the first edition of the well-received textbook Number Fields by Daniel A. Marcus? I ask because the original edition looked like it was typeset using a toaster (forgive my exaggeration). A preview of the first edition can be viewed on Google Books. It was published in 1995 by Springer, whereas I have read papers from much earlier where the typesetting was pretty good (for example, this paper of Lehmer from 1932), so I can't fathom why the typesetting was so bad. It looks like it was written on a typewriter, though given the usage of notation from algebraic number theory, it probably was not an actual typewriter.
(Thankfully, a LaTeX-ed second edition was finally published by Springer in 2018.)