Krautkramer used to have some pretty good tables that they laminated for us (back in the day before they changed their name several times) and handed out during their Level I UT classes like these. Pretty handy to have around...I have gotten pretty rusty and have to go back and dig through some of these from time to time to help a new UT guy that is just coming along. I get so used to always having the same materials to inspect day after day that I don't get to excerise the grey matter except during renewal testing every few years.
GE hands them out lamnated for their UT Level I and II courses. Velocities, Impedance, Near Field, Snell's, Skip, V -path etc. As well as the dB amplitude chart. I keep mine handy right here in my desk. Not that I use it much. We sub our UT.