Firefly moon observer's guidede Peter GregoMateriasManuels d'observationObservers' manualsAstronomy, observers' manualsEdiciones (1)Firefly moon observer's guide (2004)Firefly Books · inglésMás obras de Peter GregoGalileo and 400 years of telescopic astronomyAstronomical CybersketchingCornwalls Strangest Tales Extraordinary But True Stories