00266nam a2200109Ia 450000500170000000800410001708200170005810000200007524500280009526000230012330000100014620260205040549.0260111s9999||||xx |||||||||||||| ||und||  a154.4  B132A  aBacon, Francis. 0aAdvancement of learning  aLondonbDentc1950  a244p.