Bifacial shaping at the TK Acheulean site (Bed II, Olduvai Gorge, Tanzania): new excavations 50 years after Mary Leakey - Santonja, Manuel; Rubio Jara, Susana; Panera Gallego, Joaquín; Pérez-González, Alfredo; Rojas Mendoza, Raquel; Domínguez-Rodrigo, Manuel; Mabulla, Audax Z. P.; Baquedano, Enrique (2018)