Ciencies socials By Ricardo Batanero Sep 15, 2008 (1) Sep 15, 2009 (2) Jul 1, 2013 (1B) Period: Sep 21, 2016 to Jun 21, 2018 (3) (dates are aproximate) Jan 20, 2017 (2B) Sep 21, 2018 (4) (dates are aproximate) Apr 10, 2019 (3B) Feb 1, 2020 (4B) Mar 15, 2020 (5) Apr 14, 2020 (6) Jun 19, 2020 (7) Jun 21, 2020 (8) Sep 15, 2020 (9) Nov 11, 2020 (10) (dates are aproximate) Dec 31, 2020 (5B)