TY  - RPRT
TI  - Letter Circular 56: methods of radio direction finding as an aid to navigation: the relative advantages of locating the direction finder on shore and on shipboard
PY  - 1922
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 56
DO  - 10.6028/NBS.LCIRC.56
ER  -