00649cam a2200205 4500 101221544 TxAuBib 20080427120000.0 120422s2012||||||||||||||||||||||||eng|u 39508 Project Gutenberg PGUSA eng TxAuBib Mach, Ernst. Popular scientific lectures [Gutenberg] / by Ernst Mach; translated by Thomas Joseph McCormack. Project Gutenberg, 2012. Project Gutenberg. Freely available. Electronic text. McCormack, Thomas Joseph, Translator. http://www.gutenberg.org/license Rights TXTLL