TY - JOUR A1 - de Wit, M. T1 - Ultra-Deep Drilling through 3.5-Billion-Year-Old Crust in South Africa JO - Sci. Dril. J1 - SD VL - 11 SP - 66 EP - 73 Y1 - 2011/03/01 PB - ICDP-IODP SN - 1816-3459 UR - https://sd.copernicus.org/articles/11/66/2011/ L1 - https://sd.copernicus.org/articles/11/66/2011/sd-11-66-2011.pdf DO - 10.2204/iodp.sd.11.09.2011 ER -