TY  - BOOK
AU  - Parker,John R.
TI  - A treatise upon telegraphs: embracing observations upon the semaphoric system, with a few remarks upon the utility of the marine telegraph flags 
AV  - VK389 .P2
PY  - 1842///
CY  - Boston
PB  - Kidder & Wright
KW  - Telegraph
KW  - Signals and signaling
N1  - Cover title
ER  -