Texas The main article for this category is Soil classification. Subcategories This category has only the following subcategory. R Rock mass classification (13 P) Pages in category "Soil classification" The following 5 pages are in this category, out of 5 total. This list may not reflect recent changes. Soil classificationA AASHTO Soil Classification SystemP Polish Soil ClassificationU Unified Soil Classification SystemW World Reference Base for Soil Resources