TY  - BOOK
AU  - Humphrey,S.D.
TI  - A practical manual of the collodion process,: giving in detail a method for producing positive and negative pictures on glass and paper.  Ambrotypes.  Printing process ..
AV  - TR390 .H92
PY  - 1857///
CY  - New York
PB  - Humphrey's journal print
KW  - Photography
KW  - Ambrotype
N1  - Publisher's advertisement: 4 p. (at front)
ER  -