[Morromist]

One thing I would like to read is the history of the House of Brunswick he was supposed to be writing for much of his career. According to another website: "In the end, Leibniz was never able to complete the history, although the three volumes of his history were eventually published after his death."

But I can't seem to find them anywhere in any form.

[Schliemo]

Found the pdfs of the originals:

https://opac.regesta-imperii.de/lang_de/suche.php?qs=Leibniz...

[Morromist]

Wow! Thank you very much for finding them for me!! I'm really greatful. I'm downloading them now. Whew. 377 mb pdf - that's a big one.