NGUYEN , Q.L., BUI , X.N., CAO , X.C. i LE , V.C. 2022. An approach of mapping quarries in Vietnam using low-cost Unmanned Aerial Vehicles. Inżynieria Mineralna. 2, 2 (sty. 2022). DOI:https://doi.org/10.29227/IM-2019-02-79.