An excellent book on orchestras in general is "Anatomy of the Orchestra" by Norman del Mar. As well as all the usual instrumental range information, technical limitations, special effects, etc. that come as standard in instrumentation books, it also contains a lot of useful (or in parts simply intriguing) tidbits such as platform planning diagrams, peculiarities pertaining to various instruments, obscure score layouts, trivia (did you know Strauss's "Alpensinfonie" requires 20 horns?), a myriad of score examples, references, and details on pretty much every orchestral instrument... well, ever.
A very heartily recommended purchase.
