Anyone know what book these are from?

[Skinwalker]

I just got a spellbook that contains a couple spells I don't have in any of my reference books and my DM doesn't remember which one(s) he pulled them from. They are Improved Bull's Strength and Mass Darkvision. Anyone know where they came from? Thanks in advance.

 

[kreynolds]

Mass Darkvision is in Tome and Blood. I'm not sure about Improved Bull's Strength. I made one a while back, but doubt that's the one your DM is thinking of.