SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
13	OIL AND GAS EXTRACTION	6,111
33	PRIMARY METAL INDUSTRIES	136	39
35	MACHINERY, EXCEPT ELECTRICAL	624	104
36	ELECTRIC AND ELECTRONIC EQUIPMENT	8,240	4,629
37	TRANSPORTATION EQUIPMENT	131	6
38	INSTRUMENTS AND RELATED PRODUCTS	183	91
73	BUSINESS SERVICES	2,157	237
TOTAL		17,582	5,107

*(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.