Columbia subject headings:
Cement industries--Technological innovations--United States.
Footwear industry--Technological innovations--United States.
Labor supply--Effect of technological innovations on--United States--Case studies.
Lumber trade--Technological innovations--United States.
Wholesale trade--Technological innovations--United States.
Harvard subject headings:
Cement industries--Technological innovations--United States.
Footwear industry--Technological innovations--United States.
Footwear--Technological innovations--United States.
Industrial productivity--United States.
Labor productivity--United States.
Labor supply--Effect of technological innovations on--United States--Case studies.
Lumber trade--Technological innovations--United States.
Technological innovations--United States
Wholesale trade--Technological innovations--United States.
Princeton subject headings: