SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
16	HEAVY CONSTRUCTION CONTRACTORS	600
17	SPECIAL TRADE CONTRACTORS	548
33	PRIMARY METAL INDUSTRIES	1,532
34	FABRICATED METAL PRODUCTS	5,294
36	ELECTRIC AND ELECTRONIC EQUIPMENT	34
40	RAILROAD TRANSPORTATION	436
49	ELECTRIC, GAS, AND SANITARY SERVICES	952
TOTAL		9,396

*(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.