I read those tutorials as well! Around the same age, in '96 or '97, when I first got online, in the UK. And it might have been someone's "translation" of them into C, although I do recall reading the Pascal originals as well.

Namedropping another contemporary reference, I probably downloaded them from the Hornet Archive or a mirror.

They were a major step along the short but satisfying road to my first 3D starfield using Borland C++ (acquired via a magazine coverdisc). I felt so l33t.