I have several chess books, all of which use the P-K4 type of notation rather than the e4 type. I am still more used to the older form, since those books were my first introduction to chess literature.
I'd like to find out if anyone still uses it or can read it (1 P-K4, P-KB4; 2 N-KB3, N-QB3; etc). As far as I've seen, it's only in books.