One of the single most useful web pages on hemp is a paper written by Ernest Small and David Marcus. If you have not read it I highly recommend that you take a look at
Hemp: A New Crop with New Uses for North America. The page is quite large and takes a long time to load, but is well worth it. The
PDF version is a 43 page, 14.1MB file. I just took yet another look at it and I learn something new every time.
