Anzovin, p. 189 The first plastic car was manufactured by the Ford Motor Company, Dearborn, Mi, USA, in August 1931. Fourteen plastic panels were mounted on a tubular welded frame. (EN) Anzovin, Steven, Famous First Facts, H. W. Wilson Company, 2000, ISBN0-8242-0958-3.
"Why use up the forests which were centuries in the making and the mines which required ages to lay down, if we can get the equivalent of forest and mineral products in the annual growth of the hemp fields?" (EN) Hemp facts, su serftosurf.com. URL consultato il 17 settembre 2012 (archiviato dall'url originale il 14 settembre 2012).
