A collection of three databases in the ProQuest platform: Agricultural & Environmental Science Collection; Biological Science Collection; and Earth, Atmospheric & Aquatic Sciences Collection. Content is sourced from scholarly journals, trade and industry journals, magazines, technical reports, conference proceedings, government publications, and more.
Use ProQuest Natural Science Collection to try searching for keywords soil colour AND organic matter OR humus OR soil formation OR vegetation. Use could also consider using organic matter as a phrase search by using the quotation marks, for example "organic matter".
Note - You may need to sign in first with your CSU username and password