(Doug Massey, Princeton University, USA )
"This thorough study helps fill in the demographic history of the African-American population. With the development of consistent sets of population estimates over the 60 year period (1930 - 1990), the work increases our understanding of the quality of the census data and the completeness of coverage of the African-American population. One of the important results is the disentanglement of the age, period, and cohort effects on coverage."
(J. Gregory Robinson, U.S. Bureau of the Census)