SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	3,251	5
16	HEAVY CONSTRUCTION CONTRACTORS	51
17	SPECIAL TRADE CONTRACTORS	388
22	TEXTILE MILL PRODUCTS	282
32	STONE, CLAY, AND GLASS PRODUCTS	232
33	PRIMARY METAL INDUSTRIES	184
35	MACHINERY, EXCEPT ELECTRICAL	1,006
45	TRANSPORTATION BY AIR	3,057
50	WHOLESALE TRADE - DURABLE GOODS	1,645
TOTAL		10,096	5

*(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.