//-->
Demographic dimensions of the New Republic : American interregional migration, vital statistics, and manumissions ; 1800 - 1860
McClelland, Peter D., (1982)
The population of the British colonies in America before 1776 : a survey of census data
Wells, Robert V., (1975)
Manntal 1729 í þremur sýslum - Population census 1729 in three counties
Hansen, Hans Oluf, (1975)
Earth, water, wind, and sun : our energy alternatives
Halacy, Daniel S., (1977)