Look at the '97 volume of the companion Statistical Reference Index , also on Counter 19. Scan the user guide. You want to market your new dog food at military commissaries. Please give the full bibliographic citation. Ask for the '97 Statistical Abstract of the United States at the Reference Desk.
Emphasis is given primarily to national data.
Look at the '95 edition of County Business Patterns for Pennsylvania, located on Bay 9 in the Reference Reading Room. Turn to Table 1b. Read the cover. Ask for the 1997 RMA Annual Statement Studies at the Reference Desk. You're interested in companies that manufacture sporting and athletic goods, SIC 3949.