Variability of limestone knapping methods in Middle Palaeolithic levels M and Ob of Abric Romaní (Barcelona, Spain) - Eixea A; Bargalló A; de Soler BG; Romagnoli F; Vaquero M; Saladié P; Carbonell E; Vallverdú J; Chacón MG (Archaeological And Anthropological Sciences, 2021)