The key of wealth, or, A new way for improving of trade, lawfull, easie, safe, and effectuall : shewing how a few tradesmen agreeing together may (borrow wherewith to) double their stocks ... without ... paying any interest ... in such sort as both they and all others ... who are in a way of trading, may ... multiply their returnes ... and so, as the same shall tend much to ... inrich the people of this land ...