Title: Amateur astronomer's handbook
Description: This is a superb handbook for advanced amateur astronomers who want more than the bare, simple intro to instruments and observation.  It contains information that is very hard to find.  Nowadays, it is a little dated, but the fundamentals of instrument design and use are unchanged, and brilliantly explained.
Subjects: Amateurs' manuals, Astronomical instruments, Astronomy, Observers' manuals, Sterrenkunde, Instrumenten