I've been doing family history on my aboriginal Australian side, there were a bunch of Lutheran missions, and ever so kindly they digitized 800 pages for me, but it was all written in German. I transcribed and translated all of it.
https://drive.google.com/file/d/1en9gDgZRP7EmSHU72k6g2Iz3RRf...
I sent it back and they didn't acknowledge it, probably for various reasons, and I doubt they would like me linking it above.
Beyond being fascinating in general, I also found that from a different state in Australia there was an aboriginal who became a man of letters came to my ancestral state and was the first to write the language of the tribe, I think (not something easy to prove) it's the first ever written version of the tribal language circa ~1870 of Kuku Yalanji.