These titles in the Journey to the Past: Investigating Primary Sources series (6 titles) investigate a variety of kinds of primary sources related to American history. Individually, the books can feel patchy, more like an annotated list than a unified narrative. Each source is typically covered in one spread, including a large map or photograph, with a general introduction about the source type. The reproduced maps in Maps, ranging from colonial American to present-day GPS, are interesting, although the text's focus on change falls flat without actual comparisons. There is a surprising amount of continuity among the books in the series, and using them as a set could enrich study of a variety of topics, from the Louisiana Purchase to the U.S. space program to 9/11. Although these books might be challenging reads, they are potentially valuable classroom or library resources.