Building and using an astronomical observatoryde Doherty, PaulMateriasAmateurs' manualsAstronomical observatoriesDesign and constructionNewtonian telescopesTelescopesEdiciones (1)Building and using an astronomical observatory (1986)P. Stephens · inglésMás obras de Doherty, PaulZap ScienceThe PlanetsLe soleil et la luneThe Stars