Sorry if I'm repeating Old News here, but was very happy to find the SLUB webpages (Sächsische Landesbibliothek — Staats- und Universitätsbibliothek)...
This site very nicely complements the Hathi site, which has several missing Saxon Ranglisten.
SLUB has all of the books, at least 1850 - 1914, very easy to find and download as PDF. Also various and sundry regiment histories available.
https://digital.slub-dresden.de/werkansicht/dlf/31677/1
* find the scroll down menu to the left of the above page.