Civilian employment data collected by the U.S. Census Bureau in 1960-1990 were analyzed with respect to the following factors: (1) the six kinds of work considered in the Holland occupational classification system (realistic, investigative, artistic, social, enterprising, and conventional); (2) occupation; (3) employment; (4) gender; (5) occupational level; and (6) income. The analysis revealed stability in the census data for the occupational constructs for Holland's six kinds of work in 1960-1990. Jobs fitting Holland's descriptor "realistic" accounted for 46%-50% of all occupations over the 40-year period. Employment trends did not support claims of a major shift in employment across Holland's six types of work. Marked differences in employment between men and women were found in all six areas. Between 79% and 85% of men were employed in the realistic and enterprising areas, and only 15%-21% were employed in the four other areas. Women were employed in more varied kinds of work. The income discrepancy across the six areas was very large, with the average investigative income being more than double the average conventional income. It was recommended that career guidance programs in the schools use census information to show the relationships between kinds of work, cognitive skill development, gender, and financial income. (Contains 33 references.) (MN)