The base game only has the core stuff: PHB, MM, DMG.
However, we as a community have been adding additional files and have roughly 25-30 additional sources from multiple campaign settings (Eberron, Forgotten Realms, Dragonlance) and books such as Tome of Battle, the "Complete" set, and the "Races of" set.
While all things aren't in there (there is a lot of content in 3rd edition) you have to start getting into unusual or little known items before you start noticing missing things
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