TY  - JOUR
T1  - On the Magnetic Variations Observed at Greenwich
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 13
SP  - 87
EP  - 90
PY  - 1863/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1863.0021
M3  - doi:10.1098/rspl.1863.0021
AU  - Professor Wolf of Zurich, .
ER  -