Selected characteristics of the Spanish origin population (Mexican American, Puerto Rican, Cuban, Central or South American, and other Spanish) and labor force in the United States are presented in this chartbook, compiled from the March 1976 Current Population Survey. Divided into four sections, the chartbook looks at the size and composition of the labor force and labor force participation rates; characteristics of the unemployed and their unemployment rates; 1975 work experience (weeks worked and incidence of unemployment) and earnings received; and family income and poverty. Three appendices contain technical notes, definitions of terms, and a statistical table for each chart. Much of the data in the four sections and one appendix are cross-classified by sex, family relationship, school years completed, and other demographic and social characteristics. Data indicate that persons of Spanish origin make up 5% of the total population, 4% of the civilian labor force, 6% of the unemployed, 2% of the labor force with four or more years of college, 12% of the labor force with eight or less years of school, 2% of workers in professional or technical occupations, and 7% of those in semiskilled jobs. Twelve percent of all families in poverty are headed by Spanish-origin persons. (RS)