Agreed I used those at least once each. I am sure a few questions could have used multiple books to get the same equation or definition though so people may recall using a different book to get the same answer, but a few questions I think almost had to or certainly made it a lot easier to have the specific book.
The OSHA reference must be a Geotech specific one? I don't recall it mentioned on the Transportation list, but seems it might not have hurt to have one as I don't know many OSHA rules. Does any of the other main books have an OSHA section I may have overlooked (CERM, Green Book, other AASHTO, etc)? I also got the general Goswami book and really liked it for both AM and PM, did you find it useful for Geotech PM? I like the way it is laid out and has decent examples.
I wish I could remember a few more of the questions that needed look-ups and check on them now as I know one or two I did not have time to find since it wasn't really listed in the index so either required you to have crazy tabs on every little subject or I guess at least find the right chapter and flip through it with 5+ minutes. What could have been guaranteed points if you knew where to look or had the excess time to hunt a few books became a guess for me on at least 2. This is where I was hoping/expecting to do a few more calculation questions on main topics and was ready to nail those, but instead got surprised by the amount of look-up questions that could be a test breaker for me.