The proceedings of the XXI UISPP World Congress will be released as open-access volumes by Archaeopress, the International Union of Prehistoric and Protohistoric Sciences' long-standing publishing partner. Each volume will be available both digitally through the Archaeopress website and in print-on-demand. In addition, all individual papers from each volume will be assigned a digital object identifier (DOI) and made accessible as separate open-access publications through JSTOR.