I remember being in high school in the 80s and discovering that there was source code for a C compiler on the IBM mainframe at UIC. Then when I started digging

I remember being in high school in the 80s and discovering that there was source code for a C compiler on the IBM mainframe at UIC. Then when I started digging into it, I found that parts of it were written in SNOBOL. Fortunately, the local public library's collection of computer books was hopelessly outdated and they had a book that covered SNOBOL on their shelves.