Set of 4 high quality observing references
1) "Observing Handbook and Catalogue of Deep-Sky Objects" by Christian B. Luginbuhl and Brian A. Skiff, Cambridge Mass., Cambridge University Press, 1990, 352 pgs. Large format hard cover. An in-depth compendium of information relative to observing deep-sky objects. Very nice volume!
2) "Starlist 2000", by Richard Dibon-Smith, New York, Wiley &Sons,
1992, 400 pgs. constellation by constellation format including notes on binaries, variable stars, rising and setting azimuths, computer programs and more. A great reference manual!.
3) "Webb Society Deep Sky Observer's Handbooks"
Volume 1, "Double Stars Second edition, 1986.
Volume 2, "Planetary and Gaseous Nebulae"
Both excellent and unused.
All 4 shipped for $49. Paypal add 2%