This publication by WHO has very sciency title of "IARC Monographs on the Evaluation of Carcinogenic Risks to Humans,
VOLUME 89 Smokeless Tobacco and Some Tobacco-specific N-Nitrosamines", and like the title says it's about Tobacco-specific N-Nitrosamines, but it also happens to have rather good history of snuff and descriptions of more obscure regional smokeless tobaccos around the world. The snuff stuff starts at page 54 of the .pdf (page 43 in the original printed version).
Obviously, many may find the science interesting, as well.
pdf 3.2M: https://www.dropbox.com/s/hedu7izyql5upcc/mono89.pdf?dl=0
If the link doesn't work I also put the history part here for easier reading: https://www.reddit.com/r/nasalsnuff/wiki/history_of_snuff