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izlaidumi no Bob Friedhoffer

Cover for Bob Friedhoffer · Scientific American, Simple Science Fair Projects, Grades 3-5 (Paperback Book) (2018)

Scientific American, Simple Scie... (2018)

Bob Friedhoffer

Cover for Bob Friedhoffer · Scientific American, Winning Science Fair Projects, Grades 5-7 (Paperback Book) (2017)

Scientific American, Winning Sci... (2017)

Bob Friedhoffer