OER Knowledge CloudReportConcept Guide on Reusable Learning Objects with Application to Soil, Water and Environmental SciencesConcept Guide on Reusable Learning Objects with Application to Soil, Water and Environmental SciencesGrunwald, SabineReddy, Ramesh K.20072007/12en1-13http://oerasia.org/OERResources/4.pdfhttp://oerasia.org/OERResources/4.pdf4.pdf