For the non-CS folks among us: The Art of Electronics - Horowitz and Hill Numerical Recipes - Press et al (I know it's got flaws, but this is an interesting and readable book on math!) Classical Mechanics - Goldstein Radio Amateurs Handbook - ARRL eds. The entire MIT Intro Physics texts by A.P. French Halliday and Resnick.

I didn't mean that he's obliged to search. What I meant was that IF he should know something then he is obliged to reveal it. See CFR 1.56. So if in the normal course of his work he happened to find something then he's on the hook.