SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
13	OIL AND GAS EXTRACTION	2,468
16	HEAVY CONSTRUCTION CONTRACTORS	4,646
17	SPECIAL TRADE CONTRACTORS	5,325
20	FOOD AND KINDRED PRODUCTS	185
22	TEXTILE MILL PRODUCTS	1,173	442
24	LUMBER AND WOOD PRODUCTS	466
26	PAPER AND ALLIED PRODUCTS	2,487	719
28	CHEMICALS AND ALLIED PRODUCTS	1,916	996
32	STONE, CLAY, AND GLASS PRODUCTS	7,064
33	PRIMARY METAL INDUSTRIES	2,030
34	FABRICATED METAL PRODUCTS	754	224
35	MACHINERY, EXCEPT ELECTRICAL	6,929	1,407
36	ELECTRIC AND ELECTRONIC EQUIPMENT	696	569
37	TRANSPORTATION EQUIPMENT	257	17
39	MISCELLANEOUS MANUFACTURING INDUSTRIES	74
41	LOCAL AND INTERURBAN PASSENGER TRANSIT	303
42	TRUCKING AND WAREHOUSING	616
45	TRANSPORTATION BY AIR	2,015
49	ELECTRIC, GAS, AND SANITARY SERVICES	5,323
50	WHOLESALE TRADE - DURABLE GOODS	5,904
51	WHOLESALE TRADE - NONDURABLE GOODS	666
55	AUTOMOTIVE DEALERS & SERVICE STATIONS	1,312
TOTAL		52,609	4,374

*(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.