Just noticed that last year a children's book was published on animation film pioneer Lotte Reinger. There have also been two books on her for grownups published in the last several years:
https://www.amazon.com/Lottes-Magical-P ... 157&sr=1-2
https://www.amazon.com/Lotte-Reiniger-P ... 154&sr=1-1
The Filmstills book is from 2016 and appears to be on it's way out of print given only a few copies are still available at Amazon https://www.amazon.com/Lotte-Reiniger-F ... 154&sr=1-3