SAPROKO, IRHAM ARDI. 1610500064. The Effect of Using Semantic Mapping Strategy toward Students’ Vocabulary Achievement (An Experimental Study at the Second Grade Students of MTs Ma’arif NU 04 Songgom in the Academic Year of 2017/2018). Thesis Strata 1, English Department of Teacher Training and Education Faculty, Pancasakti University Tegal. First Advisor Drs. H. Rofiudin, M. Hum., Second A…