CLASTIC QUATERNARY SEDIMENTS OF THE AUGŠDAUGAVA SPILLWAY VALLEY AS NATURAL RESOURCES – GRAIN SIZE DISTRIBUTION AND MICROMORPHOLOGY OF QUARTZ GRAINS AS INDICATORS FOR DISTINGUISHING ALLUVIAL AND GLACIOFLUVIAL SAND DEPOSITS. ETR [Internet]. 2019 Jun. 20 [cited 2026 Mar. 11];1:272-6. Available from: https://archive-journals.rtu.lv/etr/article/view/4258