While there may not be a specific PDF resource titled "Wizardology," there are many books and academic papers that explore the concept of magic and its related fields. Here are a few resources that might be of interest:
If you do manage to find a scan, you will be disappointed. A true PDF cannot replicate the turning of a volvelle (the spinning wheel for spells). Scans of liftable flaps either show the flap down (hiding the text) or show the text but ruin the illusion. You lose about 40% of the Wizardology experience without the physical interaction. wizardology pdf full