Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
563	BRICKMASONS AND STONEMASONS	6,793
584	PLASTERERS	5,903
595	ROOFERS	2,559
704	LATHE AND TURNING MACHINE OPERATORS	5,098
755	EXTRUDING AND FORMING MACHINE OPERATORS	809
756	MIXING AND BLENDING MACHINE OPERATORS	5,903
779	MACHINE OPERATORS, NOT SPECIFIED	1,212
869	CONSTRUCTION LABORERS	7,295
TOTAL		35,572

*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.