The Adjustment and Testing of Telescope Objectives by H. Dennis Taylor Available 2MB .PDF artmisa 4 years ago 1.0k 985 0
The Story of Cosmic Rays by Germaine Beiser & Arthur Beiser Available 2MB .PDF artmisa 4 years ago 1.0k 985 0
Astronomy for Surveyors by M.K. Rice-Oxley & W.V. Shearer Available 9MB .PDF artmisa 4 years ago 1.0k 985 0