Detailed employment and educational attainment data for states, counties and metropolitan areas of 50,000 and more population. Data from 1990 Census. You can also search this file at Oregon State University's Information Sharing Project. Standard annual summary of U.S. social, political and economic statistics with recent time series which vary from volume to volume. There is some international data and a guide to sources of material.
Older editions circulate.
Some data from the Statistical Abstract is also available on the Census Bureau web site. Extract of county data from the Statistical Abstract. You can also search USA Counties at Oregon State University's Information Sharing Project.