TY  - SER
AU  -  Abney, William de Wiveleslie, 
TI  -  The Art and Practice of Silver Printing 
PY  - 2013///
PB  -  Project Gutenberg, 
KW  -  Photography -- Printing processes -- Silver
N1  -  Public domain in the USA;  Text
UR  -  http://www.gutenberg.org/ebooks/42547
ER  -