How Did Dennis Ritchie Produce His PhD Thesis? A Typographical Mystery

Some good discussion in this previous post from 2023 as well: https://news.ycombinator.com/item?id=35177110

See also

https://dl.acm.org/doi/abs/10.1145/3558100.3563839

https://www.cs.princeton.edu/~bwk/dmr/

https://dmrthesis.net/