Many entries in the Double Take series, where we look a little closer at images, come out of the steps I take to answer reference questions in my daily work. Recently, in response to a question seeking a photo of a particular building, I was browsing about 300 photographs of Dubuque, Iowa, from the Farm Security Administration/Office of War Information (FSA/OWI) Collection, taken in April 1940. Research in visual materials can include simply looking through potentially related images, recognizing that captions and title information may not always describe everything shown. As we have explained in previous Picture This posts, the FSA/OWI collection includes untitled images, which came to us without a caption. A feature in the Prints & Photographs Online…