por Edser, Edwin.
por Hadley, H E.
por Geikie, Archibald.
por Sin autor.
por Donington, G C. Autor, late senior chemistry master, city of London Scholl, author of "Pratical Exercices in Chemistry".
por Perkin, W H. Autor, PH.D. F.R.S., professor of organic chemistry in the Owens College, Manchester Lean, Bevan Autor, D Sc., B.A (Lond.) head-master of Sidecot Scholl, Somerst and late Berkeley Fellow at the Owens College, Manchester.
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