SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	4,844	71
16	HEAVY CONSTRUCTION CONTRACTORS	41,551	2,572
17	SPECIAL TRADE CONTRACTORS	17,838
29	PETROLEUM AND COAL PRODUCTS	4,252
32	STONE, CLAY, AND GLASS PRODUCTS	25,885
33	PRIMARY METAL INDUSTRIES	781
TOTAL		95,151	2,643

*(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.