SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	1,507
17	SPECIAL TRADE CONTRACTORS	2,386
20	FOOD AND KINDRED PRODUCTS	137
21	TOBACCO MANUFACTURERS	5
28	CHEMICALS AND ALLIED PRODUCTS	98
34	FABRICATED METAL PRODUCTS	905
35	MACHINERY, EXCEPT ELECTRICAL	83
37	TRANSPORTATION EQUIPMENT	4,554	355
38	INSTRUMENTS AND RELATED PRODUCTS	89
42	TRUCKING AND WAREHOUSING	84
49	ELECTRIC, GAS, AND SANITARY SERVICES	342
80	HEALTH SERVICES	77
TOTAL		10,319	355

*(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.