Sitzungs-berichte der Gesellschaft naturforschender Freunde zu Berlin.
Gesellschaft naturforschender Freunde (Berlin, Germany)
[Berlin : R. Friedländer und Sohn],
1839-
Both 1941 and 1942 are called New series.
Reports for 1839-1859 published in 1912.
Suspended publication 1943-1960.
Natural history
Natural history