SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
17	SPECIAL TRADE CONTRACTORS	7,830
27	PRINTING AND PUBLISHING	823
28	CHEMICALS AND ALLIED PRODUCTS	1,187	52
31	LEATHER AND LEATHER PRODUCTS	110	44
33	PRIMARY METAL INDUSTRIES	474
34	FABRICATED METAL PRODUCTS	804
36	ELECTRIC AND ELECTRONIC EQUIPMENT	2,218	764
37	TRANSPORTATION EQUIPMENT	672	61
45	TRANSPORTATION BY AIR	6,707	57
73	BUSINESS SERVICES	144
TOTAL		20,970	978

*(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.