00563cam a2200181 4500 377028336 TxAuBib 20170330120000.0 140224s2014||||||||||||||||||||||||eng|u 45004 Project Gutenberg PGUSA eng TxAuBib Sleffel, Charles Conrad. The Library of Work and Play [Gutenberg] : Working in Metals / Charles Conrad Sleffel. Project Gutenberg, 2014. Public domain in the USA. Text. Metal-work. http://www.gutenberg.org/ebooks/45004