00728cam a2200205 4500 377774834 TxAuBib 20170331120000.0 161110s2016||||||||||||||||||||||||eng|u 53494 Project Gutenberg PGUSA eng TxAuBib Calver, George. New Edition of Hints on Silver-Glass Reflecting Telescopes Manufactured by Mr. G. Calver, F.R.A.S [Gutenberg] : with Directions for Silvering, Adjusting, &c / George Calver. Project Gutenberg, 2016. Public domain in the USA. Text. Scientific apparatus and instruments. Reflecting telescopes. http://www.gutenberg.org/ebooks/53494 TXTLL