http://nationalhempassociation.org/some-interesting-faces-about-hempcrete-as-a-building-material/
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http://nationalhempassociation.org/some-interesting-faces-about-hempcrete-as-a-building-material/
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http://nationalhempassociation.org/when-george-washington-visited-t...
"President George Washington was thinking of having a hemp mill and wishing to see how David Witmer’s worked decided when in Lancaster in 1794 to go to Philadelphia over the new Lancaster and Philadelphia Turnpike, and stop at Paradise. While looking at this hemp mill something went wrong and there was an explosion. One man was gravely hurt and nothing was heard of Washington having a hemp mill for years after. On the north end of “my father’s store” wrote Jessie Witmer Landis could be seen the broken wheel of the hemp mill of 1794!"