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CONTENTS 1
1．George Stephenson 1
2．Thomas Alva Edison 31
3．William Harvey 58
4．Charles Darwin 86
5．Gregor Mendel 104
6．Louis Pasteur 116
7．Dr．Jane C．Wright 131
8．Dr．Rosalyn S．Yalow 146
9．Benjamin Franklin 163
10．Luther Bubank 176
VOCABULARY 185