Debian wheezy: switch to GNOME 2

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http://unix.stackexchange.com – The installation of wheezy defaulted to the KDE desktop environment. How do I remove it and switch to GNOME 2 (the version that is used in stable)? I fear that if I just install gnome-core, it will install GNOME 3. Can I just make sources.list point to an older version of some package? I prefer GNOME 2 because it works well with bluetile (I don't want MATE, or other copies). (HowTos)