Not exactly architectural references, but some of these are just begging to be made into overlays.
Image from page 342 of "Breeder and sportsman" (1882) by Internet Archive Book Images, on Flickr
Image from page 1127 of "Highland Echo 1915-1925" (1915) by Internet Archive Book Images, on Flickr
Image from page 551 of "Canadian grocer January-March 1918" (1918) by Internet Archive Book Images, on Flickr
They come from a photostream of 2.6 million images scanned from old books and uploaded, takes a bit of digging to find good stuff since it's a huge hodgepodge of crap, but everything in there has a nice vintagey feel.
https://www.flickr.com/photos/internetarchivebookimages/
Image from page 342 of "Breeder and sportsman" (1882) by Internet Archive Book Images, on Flickr
Image from page 1127 of "Highland Echo 1915-1925" (1915) by Internet Archive Book Images, on Flickr
Image from page 551 of "Canadian grocer January-March 1918" (1918) by Internet Archive Book Images, on Flickr
They come from a photostream of 2.6 million images scanned from old books and uploaded, takes a bit of digging to find good stuff since it's a huge hodgepodge of crap, but everything in there has a nice vintagey feel.
https://www.flickr.com/photos/internetarchivebookimages/