In World War II, fibre was in great demand, so after outlawing hemp as marijuana in 1937, by 1942 the USA Department of Agriculture had made a call to patriotic farmers to grow hemp, with a 14 minute news reel “Hemp for Victory”
In Germany they had the same issues regarding the demand for fibre and the Government encouraged Germans to grow the lustrous hanf (hemp) fibre, with a houmerous primer (pamphlet) which explained how to grow and process hemp. See the document here GermanPrimer-PDF-72dpi
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