This is a good example of why checking more than one site, set of digital images, database, etc. is necessary.
I'm in the process of trying to locate a copy of a 1944 letter my great-grandfather sent to the Prairie Farmer magazine. Google Books is how I found the reference and the snippet view is pretty clear that the name in the magazine is Fred Ufkes.
I searched at HathiTrust for the same item and it was not located.
Of course, there are reasons why the item was not found:
- The digital image used by HathiTrust was not comparable quality to the one on Google Books.
- The OCR used by HathiTrust did not recognize "Ufkes" as "Ufkes."
Are you limiting your searches?