This social stratification became a permanent fixture of English society.
"Our Legal Heritage, 5th Ed." by S. A. Reilly
We have discussed the material foundation and the stratification of the German people when full socialization has been realized.
"The New Society" by Walther Rathenau
Much less of social stratification exists in the country than in the city.
"New Ideals in Rural Schools" by George Herbert Betts