TY  - BOOK
AU  - Stetson,Harlan T.
AU  - Appleton,Edward Victor
ED  - Ronald Press Company.
TI  - Sunspots in action
T2  - Humanizing Science Series
PY  - 1947///
CY  - New York
PB  - The Ronald Press Company
N1  - Bibliografia na stronach 231-237. Indeksy
UR  - https://library.put.poznan.pl/spisy_tresci/225292.pdf
ER  -