Archive.org has a really pristine scan of "Western Mandarin, or, The spoken language of western China" by Grainger, Adam.
It's great. It really is.
It is completely comprised of "photos", though, only. So, not really searchable, aside from a Radical Index, if you get your thrills in the futility of stroke order.
The "Full Text" and "ePub" options on archive.org are awful.
and the "Full Text" version:
^ T and P? T
servants and door keepers.
There must be a good OCR of this pdf, no?