VILLE, S. (1987). DEFENDING PRODUCTIVITY GROWTH IN THE ENGLISH COAL TRADE DURING THE 18TH AND 19TH CENTURIES. ECONOMIC HISTORY REVIEW, 40(4), 597-602. Retrieved from http://gateway.webofknowledge.com/
VILLE, S. (1987). DEFENDING PRODUCTIVITY GROWTH IN THE ENGLISH COAL TRADE DURING THE 18TH AND 19TH CENTURIES. ECONOMIC HISTORY REVIEW, 40(4), 597-602. Retrieved from http://gateway.webofknowledge.com/