Three Weeks in the Gold Mines, or Adventures with the Gold Diggers of California in August, 1848. Together with Advice to the Emigrants, with Full Instructions Upon the Best Methods of Getting There, Living Expenses, etc. etc., and a Complete Description of the Country. With a Map and Illustrations
New York: Joyce and Co., 1848.
Noted historian Dale Morgan called Simpson's guide "an outright fraud." It is one of the earliest dated guides and it was designed to take advantage of the gold fever sweeping the continent. Simpson, despite the claims in the text, never made a trip to California or stayed in the mines. Further, Simpson was never a member of the New York Volunteers as stated on the title page's author statement. Like many publications of the day, it pulled together information from various sources including Colonel R. B. Mason's reliable report on the gold diggings and an article from the New York Herald of December 13, 1848.