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ספרים בחינם

The Practical Astronomer Comprising illustrations of light and colours--practical descriptions of all kinds of telescopes--the use of the equatorial-transit--circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy

Thomas Dick · 2017

ספרייה ציבורית, Project Gutenberg. בלי הרשמה.

AstronomyTelescopesAstronomical instruments