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They don't add up to steam library, but you can get them for free here http://www.rockstargames.com/classics/
EDIT: sorry, seems they have taken down that one also :/
Grand Theft Auto Complete Pack (SubID 18832) includes GTA 1 and GTA 2, as you can see on the linked page from SteamDB.
The package is removed from Steam.
steam key or gift