TY  - BOOK
AU  - Crawford,William
TI  - The keepers of light: a history & working guide to early photographic processes 
SN  - 0871001586
AV  - NR330 .C68
U1  - 770/.28 
PY  - 1979///]
CY  - Dobbs Ferry, N.Y.
PB  - Morgan & Morgan
KW  - Photography
KW  - Printing processes
KW  - History
N1  - Includes index; Bibliography: pages [307]-310
ER  -