The Socialization of Money by E. F. Mylius (pdf)
Described by Claude McKay as a "worthless book", Mylius's treatise is like Keynes before Keynes, and without Keynes's mistakes. Proudhon had not come to that learned man's attention.
Anyway, Mylius was the bookkeeper for Max Eastman's Liberator, in which capacity he was able to "privatize" a great deal of money from the magazine's funds. I mention this, but really, why should a person have to have an account of their crimes hung round their neck, like a stupid cow bell? An ordinary person, I mean.