Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
Where Mummified Raptor Skull Fits
Items Numbered Next to Mummified Raptor Skull
Blizzard numbers items as they are created, so the named items next to ID 159921 (159915 to 159926) were usually added in the same batch as Mummified Raptor Skull: the same quest line, zone, vendor or reward set.