SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	9,664
17	SPECIAL TRADE CONTRACTORS	4,244
28	CHEMICALS AND ALLIED PRODUCTS	584	22
29	PETROLEUM AND COAL PRODUCTS	105
33	PRIMARY METAL INDUSTRIES	243
34	FABRICATED METAL PRODUCTS	2,886	167
35	MACHINERY, EXCEPT ELECTRICAL	13,700	1,476
36	ELECTRIC AND ELECTRONIC EQUIPMENT	246
37	TRANSPORTATION EQUIPMENT	498
41	LOCAL AND INTERURBAN PASSENGER TRANSIT	3,897
45	TRANSPORTATION BY AIR	1,937	28
49	ELECTRIC, GAS, AND SANITARY SERVICES	13,585
50	WHOLESALE TRADE - DURABLE GOODS	1,450
73	BUSINESS SERVICES	712	593
80	HEALTH SERVICES	82	27
TOTAL		53,832	2,313

*(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.