By Kirsten Salyer
The Big Picture on the cost of U.S. Treasury bonds over time
UN Department of Economic and Social Affairs on super-cycles of commodity prices since the mid-19th century
Munich Personal Repec Archive on the impact of the 1937 Japanese invasion of China
The London School of Economics on the early days of the euro
Harvard Kennedy School on Standard Oil's success as an innovator
To read more from Echoes, Bloomberg View's economic history blog, click here.