TY  - JOUR
T1  - On the Magnetic Elements and their Secular Variations at Berlin
JF  - Proceedings of the Royal Society of London (1854-1905)
VL  - 13
SP  - 218
EP  - 225
PY  - 1863/01/01/
UR  - http://dx.doi.org/10.1098/rspl.1863.0050
M3  - doi:10.1098/rspl.1863.0050
AU  - Erman, A.
ER  -