TY  - BOOK
T1  - Periodic solar variation
T2  - Smithsonian Miscellaneous Colections ;
A1  - Abbot, Charles Greeley
PP  - Washington, D. C
PB  - Smithsonian Institution
YR  - 1955
UL  - http://vufind10-pruebas.sigbunlp.bibliotecas.unlp.edu.ar/Record/dun.167537
OP  - 20
ER  -