SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
28	CHEMICALS AND ALLIED PRODUCTS	978	386
29	PETROLEUM AND COAL PRODUCTS	974	375
36	ELECTRIC AND ELECTRONIC EQUIPMENT	610	44
37	TRANSPORTATION EQUIPMENT	51
46	PIPE LINES, EXCEPT NATURAL GAS	4,190
TOTAL		6,803	805

*(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.