00374nam a2200121Ia 450000500170000000800410001708200120005810000460007024500380011626000520015430000090020665000370021520240821160054.0240821s9999||||xx |||||||||||||| ||und||  a307 ARL  aArlington County Schools Board, Arlington 0aSenior high school social studies  aArlingtonbArlington County Schools Boardc1964  a209p  aSocial Science-Teaching/Research