Autograph signature to letter : Potsdam, to Cassini de Thury, 1776 Sept. 9.
Related Entities
There are 2 Entities related to this resource.
Frederick II, King of Prussia, 1712-1786
http://n2t.net/ark:/99166/w68f0m7c (person)
Cassini, César-François, 1714-1784,
http://n2t.net/ark:/99166/w6r244dw (person)