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The Earth-Shaking Facts About Earthquakes with Max Axiom, Super Scientist
by Katherine Krohn ; ill. by Tod Smith and Al Milgrom 1st ed.. Capstone Press, 2008 書
Madam C.J. Walker and New Cosmetics
by Katherine Krohn 1st ed.. Capstone, 2007 書
Jonas Salk and the Polio Vaccine
