What Was D-Day?

Patricia Brennan、David G、Scott Anderson 著 / Penguin Young Readers Group / 2015-04 / 平装

What Was the Hindenburg? 英文原版

Janet Pascal、David Groff、Kevin Mcveigh 著 / Penguin Young Readers Group / 2014-12 / 平装

What Was Pompeii?

Jim、Fred、John Hinderliter 著 / Penguin Young Readers Group / 不详 / 平装

What Was the Underground Railroad?

Yona Z、Lauren、James Bennett 著 / Penguin Young Readers Group / 不详 / 其他

What Were the Twin Towers?

Jim O\'Connor, Ted Hammond 作者 / Turtleback Books / 2016-05 / 其他