TY  - BOOK
T1  - Sun spots, comets, and calamities
A1  - Henson, Mariano A. 1897-
LA  - English
PP  - Angeles, Pampanga
PB  - s.n.
YR  - 1953
UL  - https://ds.mainlib.upd.edu.ph/Record/UP-99796217604214328
CN  - QB 525 H45
KW  - Sun-spots.
KW  - Comets.
ER  -