TY  - BOOK
AU  - Olmsted,Denison
TI  - On the recent secular period of the aurora borealis
T2  - Smithsonian contributions to knowledge. [vol. VIII, art. 3]
AV  - Q11 .S68 vol. 8
PY  - 1856///]
CY  - [Washington
PB  - Smithsonian Institution
KW  - Auroras
ER  -