AP3456 would be a good place to start. There is an eleccy copy around, great for copy n paste for handouts.
as for slides, nope sorry. But for a fundamental exercise like stalling, you should only need three max...
If the secret training base you speak of is cranditz then the thompson library (for those engineering geek types) has a full raft of books on aerodynamics and flow, will explain stall right down to the technical level (perhaps too far?)
Dont forget your blue, black and red pen! They always dig that admin trainer rubbish!