Snyder, HarryUniversity of Minnesota. Division of Agricultural Chemistry2017-02-032017-02-031905-01Snyder, Harry. Soil investigations: the influence of crop rotations and use of farm manures upon the humus content and fertility of soils; the water soluble plant food of soils; the production of humus in soils. 1905. Saint Paul, Minn.: University of Minnesota. Agricultural Experiment Station. Bulletin 89, page 191-212https://hdl.handle.net/11299/183833This archival publication may not reflect current scientific knowledge or recommendations. Current information available from University of Minnesota Agricultural Experiment Station: http://www.maes.umn.edu/enNewsletter or Bulletin