I took and used (both times!) the "Land Surveyor Reference Manual" sadly, also by PPI, but it really covers a lot of stuff that could show up on the TR exam (earthwork, bearings, vertical curves, RR curves & "stuff")
There is an old classic thats good Hickerson - Route Location and Design. Some of it its dated, but it covers mass haul, spirals, finding sight dist on curves very well.
Also covers spirals and hw to shift tangents.
You may be able to borrow it from a university library.