!!!! Humic substances

==== Wikipedia

https://en.wikipedia.org/wiki/Talk:Humic_substance @@ https://en.wikipedia.org/wiki/Talk:Humic_substance
https://en.wikipedia.org/wiki/Humic_acid @@ https://en.wikipedia.org/wiki/Humic_acid
https://en.wikipedia.org/wiki/Humic_substance @@ https://en.wikipedia.org/wiki/Humic_substance

==== References
file:///home/jstolfi/projects/wikipedia/docs/humic-acids-their-sodium-salts-summary-report-committee-veterinary-medicinal-products_en.pdf
https://www.google.com.br/search?q=humic+acid&num=30&client=ubuntu&ei=mBLAW8rdMYarwgTOlI14&start=90&sa=N&biw=1326&bih=567 @@ https://www.google.com.br/search?q=humic+acid&num=30&client=ubuntu&ei=mBLAW8rdMYarwgTOlI14&start=90&sa=N&biw=1326&bih=567
https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/07_1_CINCINNATI_01-63_0012.pdf @@ https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/07_1_CINCINNATI_01-63_0012.pdf
https://dl.sciencesocieties.org/publications/sssaj/abstracts/57/1/SS0570010283?access=0&view=pdf @@ https://dl.sciencesocieties.org/publications/sssaj/abstracts/57/1/SS0570010283?access=0&view=pdf
https://www.fishersci.com/us/en/products/I9C8K4Z4/humic-acid.html @@ https://www.fishersci.com/us/en/products/I9C8K4Z4/humic-acid.html
https://www.tandfonline.com/doi/pdf/10.1080/00380768.1965.10433805 @@ https://www.tandfonline.com/doi/pdf/10.1080/00380768.1965.10433805
https://scholar.google.com.br/scholar?hl=en&as_sdt=0%2C5&q=Sprengel+Gesammte+Naturlehre&btnG= @@ https://scholar.google.com.br/scholar?hl=en&as_sdt=0%2C5&q=Sprengel+Gesammte+Naturlehre&btnG=
https://onlinelibrary.wiley.com/doi/pdf/10.1002/jpln.200900065 @@ https://onlinelibrary.wiley.com/doi/pdf/10.1002/jpln.200900065
https://www.google.com.br/search?q=Humic+acid+from+leonardite+youngs+frost&oq=Humic+acid+from+leonardite+youngs+frost&aqs=chrome..69i57.7575j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8 @@ https://www.google.com.br/search?q=Humic+acid+from+leonardite+youngs+frost&oq=Humic+acid+from+leonardite+youngs+frost&aqs=chrome..69i57.7575j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8
https://www.sciencedirect.com/science/article/pii/001670619390009A @@ https://www.sciencedirect.com/science/article/pii/001670619390009A
https://www.sciencedirect.com/science/article/pii/S2238785417304982 @@ https://www.sciencedirect.com/science/article/pii/S2238785417304982
https://www.science.gov/topicpages/l/leonardite+humic+acid @@ https://www.science.gov/topicpages/l/leonardite+humic+acid
https://nmgs.nmt.edu/publications/guidebooks/downloads/25/25_p0333_p0336.pdf @@ https://nmgs.nmt.edu/publications/guidebooks/downloads/25/25_p0333_p0336.pdf
https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/Merge/Vol-07_1-0001.pdf @@ https://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/Merge/Vol-07_1-0001.pdf
https://mspace.lib.umanitoba.ca/bitstream/handle/1993/7338/Dilk_Agronomic_evaluation.pdf;jsessionid=FB026EB15F967579037173BA1436D736?sequence=1 @@ https://mspace.lib.umanitoba.ca/bitstream/handle/1993/7338/Dilk_Agronomic_evaluation.pdf;jsessionid=FB026EB15F967579037173BA1436D736?sequence=1
https://cdn-pubs.acs.org/doi/pdf/10.1021/jf60153a041?src=recsys @@ https://cdn-pubs.acs.org/doi/pdf/10.1021/jf60153a041?src=recsys