TY  - GEN
TY  - GEN
T1  - Trackers of the skies
T2  - Smithsonian publication
A1  - Hayes, Eugene Nelson
LA  - eng
PP  - Washington
PB  - Smithsonian Institution
YR  - 1967
UL  - https://kansalliskirjasto.finna.fi/Record/fikka.197969
OP  - 186
KW  - Smithsonian Astrophysical Observatory.
KW  - Artificial satellites : Tracking.
ER  -