The Hold-to-Light cards in the David P. Campbell Postcard Collection have a wide dispersion over the United States and Europe, and even one from Argentina. The Copper Window cards, however, are predominately travel postcards, which show a popular tourist attraction. These cards are indeed clustered in the New England Area. This tells us that these coastal states were popular travel destinations in the early 1900s. To explore this interactive map, please follow the link below:
"A Map Based on the "Hold-to-Light" Binder,"
Student Projects from the Archives: Vol. 1
, Article 9.
Available at: https://ideaexchange.uakron.edu/spa/vol1/iss1/9