From two scholars of economic history, an attempt to define and measure the "objective" value or worth over time of items such as purchasing power, inflation rates, stock growth rates, etc.
From the Minneapolis Federal Reserve Bank, calculate the value of the dollar for any year from 1913 to the present, as based on the Consumer Price Index. Also has estimates from 1800 to present.
To convert the value of the dollar in any year from 1774 onward to a current dollar rate, a chart is provided with an annual conversion rate number. Prepared by an Oregon State University political science faculty member.