What fonts or typefaces were commonly used in old (pre-1950) mathematics literature? I recall reading some books in my university library which were published in the 1920s and 1930s, and am wondering about their fonts. They looked very nice, and I would like to find some. It seems Monotype Modern was one such font, but it somehow costs hundreds of dollars despite the fact that its creator has been dead for a century. Are there open source versions of such classic mathematical fonts?

> **Hint:** Some related information is given in _Mathematical Typography_ by D.E. Knuth from 1979. He discusses aspects of the development of typography used in _AMS Transactions_ from 1900 up to the late 1970s in order to introduce $\TeX$ and $\mathrm{METAFONT}$.