SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
27	PRINTING AND PUBLISHING	103
35	MACHINERY, EXCEPT ELECTRICAL	21,782
37	TRANSPORTATION EQUIPMENT	1,619	97
38	INSTRUMENTS AND RELATED PRODUCTS	1,193	852
45	TRANSPORTATION BY AIR	6,707	57
TOTAL		31,404	1,006

*(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.