Columbia subject headings:
Exports--Canada--Statistics.
Exports--Japan--Statistics.
Exports--United States--Statistics.
Statistics.
Harvard subject headings:
Exports
Technological innovations
Princeton subject headings:
Exports--Canada--Statistics.
Exports--Japan--Statistics.
Exports--United States--Statistics.
Input-output analysis.
Research, Industrial--Canada.
Research, Industrial--Japan.
Research, Industrial--United States.
Statistics.
Technological innovations--Canada.
Technological innovations--Japan.
Technological innovations--United States.