SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
13	OIL AND GAS EXTRACTION	26,676
15	GENERAL BUILDING CONTRACTORS	8,203	453
16	HEAVY CONSTRUCTION CONTRACTORS	16,328	614
17	SPECIAL TRADE CONTRACTORS	104,575	40
20	FOOD AND KINDRED PRODUCTS	2,408
21	TOBACCO MANUFACTURERS	16
22	TEXTILE MILL PRODUCTS	587
23	APPAREL AND OTHER TEXTILE PRODUCTS	5,670	421
24	LUMBER AND WOOD PRODUCTS	2,515
25	FURNITURE AND FIXTURES	216
26	PAPER AND ALLIED PRODUCTS	3,663	276
27	PRINTING AND PUBLISHING	12,482	2,615
28	CHEMICALS AND ALLIED PRODUCTS	20,216	5,260
29	PETROLEUM AND COAL PRODUCTS	364
30	RUBBER AND MISC. PLASTICS PRODUCTS	9,490	1,677
32	STONE, CLAY, AND GLASS PRODUCTS	15,458	1,739
33	PRIMARY METAL INDUSTRIES	16,719	82
34	FABRICATED METAL PRODUCTS	46,090	22,358
35	MACHINERY, EXCEPT ELECTRICAL	76,932	31,764
36	ELECTRIC AND ELECTRONIC EQUIPMENT	178,453	120,185
37	TRANSPORTATION EQUIPMENT	20,834	5,732
38	INSTRUMENTS AND RELATED PRODUCTS	45,951	23,794
39	MISCELLANEOUS MANUFACTURING INDUSTRIES	17,167	10,121
40	RAILROAD TRANSPORTATION	196
41	LOCAL AND INTERURBAN PASSENGER TRANSIT	516
42	TRUCKING AND WAREHOUSING	2,748	201
45	TRANSPORTATION BY AIR	17,672	57
46	PIPE LINES, EXCEPT NATURAL GAS	599
48	COMMUNICATION	32,248	1,827
49	ELECTRIC, GAS, AND SANITARY SERVICES	24,780	274
50	WHOLESALE TRADE - DURABLE GOODS	5,687	46
51	WHOLESALE TRADE - NONDURABLE GOODS	1,359
73	BUSINESS SERVICES	18,182	3,219
76	MISCELLANEOUS REPAIR SERVICES	23,324	2,153
80	HEALTH SERVICES	9,141	1,468
TOTAL		767,619	236,378

*(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.