21 Oct
2020
21 Oct
'20
8:57 p.m.
A Practical Manual, by Samuel Dwight Humphrey 63517 [Full title: A Practical Manual of the Collodion Process, Giving in Detail a Method For Producing Positive and Negative Pictures on Glass and Paper.] [Link: http://www.gutenberg.org/6/3/5/1/63517 ] [Files: 63517-8.txt; 63517-h.htm] Thanks to Tom Cosmas produced from files generously provided on The Internet Archive. All resultant materials are placed in the Public Domain. Chuck