Leveling in Classic isn’t as fast as leveling on Live servers in World of Warcraft, but there are ways to speed up the process
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Classic WoW: General Speedleveling Guide 1-60
WoW Hardcore Leveling Guide: How to Level Up Fast in WoW HC - WoW Classic Hardcore Articles
Class Picking Guide for WoW Classic - Choose Your Best Class
Azuarc's Leveling Guide intro :: Wiki :: World of Warcraft :: ZAM