TY  - GEN
AU  - Morgan, A H
C2  - , National Institute of Standards and Technology, Gaithersburg, MD
DA  - 1947-01-01 05:01:00
DO  - https://doi.org/10.6028/NBS.CRPL.7-1
LA  - en
PB  - , National Institute of Standards and Technology, Gaithersburg, MD
PY  - 1947
TI  - Preliminary instructions for obtaining and reducing manual ionospheric records:
ER  -