Pages 14 and 15. They are not listed separately, but are described generically as "Least Legacy", "Lesser Legacy", and "Greater Legacy".
They work like Weapon Focus and Greater Weapon Focus; there is only one feat entry for each, but you select the specifics of it when you take it. Just like you would take "Weapon Focus (bastard sword)" instead of a new feat "Bastard Sword Weapon Focus [General]", you take "Least Legacy (Mithron Hammer)".