Melinda is writing a research paper about the Battle of the Bulge during World War II. She has discovered the following quote during her research: "On 16 December, powerful German forces struck the lightly held sector of the First Army front south of Monschau in the Ardennes. German armored spearheads drove toward the Mouse River, aiming at Antwerp. Aided by bad weather, a variety of deceptive measures, and the failure of Allied intelligence correctly to interpret the signs of an impending attack, they achieved complete surprise." 6 Melinda is unfamiliar with the geography of Germany, so the locations are confusing. Which of the following tools would be best in aiding her with her research?