Swords & Wizardry is for original D&D, the three little booklets. Additional material from supplements depends on the version of S&W. There are White box, Core and Complete.
OSRIC (Old School Reference and Index Compilation) is the ultimate clone of 1st edition Advanced Dungeons & Dragons. Originally meant to be a tool for publishers to publish 1e compatible material. OSRIC webpage has tons of stuff.
Labyrinth Lord emulates basic and expert editions of Dungeons & Dragons in one book. Goblinoid Games has done a great job with LL. And with Original Edition Characters and Advanced Edition Companion supplements you can turn Labyrinth Lord into older-old-school version of D&D and in lite 1e version of D&D.
Best thing is, you can get all three of these for free. And all of these are in print!
Do you think these three old-school-rules are the holy trinity of D&D emulation of 70's and early 80's? Or do you have a better combination in mind?