Matches in DBpedia 2014 for { ?s ?p John Martin's Book was a children's magazine aimed at five- to eight-year-olds. Martin Gardner has written that it was a "pioneering publication" and the "most entertaining magazine" aimed at this age group published in the US. Priced from 10 to 50 cents over its twenty-year run, it was primarily purchased by middle and upper income families due to its cost."John Martin" was the pseudonym of Morgan van Roorbach Shepard (April 8, 1865–May 16, 1947).. }
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- John_Martin's_Book comment "John Martin's Book was a children's magazine aimed at five- to eight-year-olds. Martin Gardner has written that it was a "pioneering publication" and the "most entertaining magazine" aimed at this age group published in the US. Priced from 10 to 50 cents over its twenty-year run, it was primarily purchased by middle and upper income families due to its cost."John Martin" was the pseudonym of Morgan van Roorbach Shepard (April 8, 1865–May 16, 1947).".