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age groups agencies Agricultural Economics American American Economic Association American Statistical Association assessors average birth Census Bureau census data census enumerations Census of Agriculture changes cities classes committee conduct norms considerable counties crime criminal criminal law criminology Crop and Livestock culture conflict definite delinquency Department of Agriculture differential Division of Crop employment capacity enumeration districts etiological factors farm population field foreign-born given immigrant important in-migrants income increase indicate industrial internal migration labor Livestock Estimates ment merators method minor civil divisions Molokan native white nature Negro nomic occupational out-migrants percent period persons population redistribution possible probably problem procedure production QUERY questions rates ratio regional residence rural areas rural-urban rural-urban migration sample scientific secured selection Statistical Board suggested supervisors tabulation tion trends tural U. S. Government Printing urban violations William Carlson workers