Cognitive class and education, 1900-1990
Cognitive partitioning by occupation
The economic pressure to partition
Steeper ladders, narrower gates
Unemployment, idleness, and injury
Ethnic differences in cognitive ability
Ethnic inequalities in relation to IQ
The demography of intelligence
Social behavior and the prevalence of low cognitive ability
Raising cognitive ability
The leveling of American education
Affirmative action in higher education
Affirmative action in the workplace