I've carefully scanned and processed the entirety of Exercises in the Yokohama Dialect. To be precise, the copy I own is a 1953 reprinting of the 1879 pamphlet. If you know even a little Japanese, it will be a very amusing or painful.
You can view it online now. Alternatively, you may download zip files of the processed scans, with HTML, (4.7MB) for offline viewing or the original scans (25MB) in their full, 1850x1448 glory. If you're in a hurry, go straight to the first lesson for a mouth-opening experience.
I believe this work is in the public domain. If you're a US copyright lawyer who believes otherwise, please contact me.