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Alexander Efron has written:

'The teaching of physical sciences in the secondary schools of the United States, France, and Soviet Russia' -- subject(s): Chemistry, Education, Physics, Science, Secondary Education, Study and teaching, Study and teaching (Secondary)

'Light' -- subject(s): Light

'Exploring mechanics'

'Direct current electricity' -- subject(s): Electricity

'Heat' -- subject(s): Heat

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10y ago

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