Dear Readers, This is the last and fourth issue (No. 68) of our journal in 2021. This issue includes twelve articles by authors from research centers in Poland and abroad. The articles deal with diverse problems in the following branches of science: Civil Engineering and Transport, Environmental Engineering, Mining and Energy, Material and Mechanical Engineering, Economics, Management and Quality Science and Information and Communication Technology.
We hope that the presented studies will receive much interest, and it will inspire discussion and drive new research.
With kind regards, Izabela Dembińska (Editor-in-chief)