421310  Lumber, Plywood, Millwork, and Wood Panel Wholesalers 

This U.S. industry comprises establishments primarily engaged in 
wholesaling lumber; plywood; reconstituted wood fiber products; 
wood fencing; doors and windows and their frames (all materials); 
wood roofing and siding; and/or other wood or metal millwork. 

The data published with NAICS code 421310 include the following 
SIC industry:

     5031 (pt)  Lumber, plywood, millwork, and wood panels