SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	8,627	634
32	STONE, CLAY, AND GLASS PRODUCTS	1,962	1,660
36	ELECTRIC AND ELECTRONIC EQUIPMENT	148	37
38	INSTRUMENTS AND RELATED PRODUCTS	6,647	4,280
45	TRANSPORTATION BY AIR	55
73	BUSINESS SERVICES	14
TOTAL		17,453	6,611

*(1) By survey design, not all 2-digit SICs were surveyed. (2) The estimates for each 2-digit SIC apply only to the 3- and 4-digit SICs surveyed within the 2-digit SIC. Not all SICs were surveyed. (3) When using the estimates, standard errors associated with estimates should be considered. (4) 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.