An archive of printed guides for Super Smash Bros.
Super Smash Bros. Official Strategy Guide (BradyGames)
If I don't miss my guess, the only strategy guide published for the original Smash Bros. in the US was from BradyGames -- Nintendo didn't publish one themselves for this title. At any rate, this guide is probably the most in-depth coverage of Smash Bros. between two covers.
Nintendo Power Vol. 119 (April 1999)
This issue of NP featured extensive coverage on Super Smash Bros.