Brown, 2002, p 245. Conversion from 1913 to 2006 U.S. dollars assumes a conversion factor of 0.049, according to Robert Sahr, Consumer Price Index, Oregon State University. Retrieved 10 april 2007. Arkiverad 5 oktober 2007 hämtat från the Wayback Machine.
Brown, 2002, p 245. Conversion from 1913 to 2006 U.S. dollars assumes a conversion factor of 0.049, according to Robert Sahr, Consumer Price Index, Oregon State University. Retrieved 10 april 2007. Arkiverad 5 oktober 2007 hämtat från the Wayback Machine.