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Between the 1880s and 1930s, investors developed over seventy pulp and paper mill sites to exploit the woods and inland waters of Maine. Authors John Clark and Deryck Holdsworth tracked the changing historical geographies of papermaking in Maine during this period through an analysis of data from Lockwood’s Directory, the industry’s leading monitor of investment. They also mapped mill sites, noting their changing capacity and shifts in product types as consumer needs evolved. Their work shows how the development of a railroad network helped facilitate a shift from smaller mills at coastal sites to larger mills at inland settings, which exploited water power from the state’s major rivers. This spatial shift, they argue, was also accompanied by an increasing portion of the ownership being controlled by out[1]of-state capital. John Clark, Data Visualization and GIS Librarian at Lafayette College in Easton, Pennsylvania, is a contributing author to the Historical Atlas of Maine (2015). Deryck Holdsworth, Emeritus Professor of Geography at Pennsylvania State University, is the co-editor of the Historical Atlas of Canada, Vol. III: Addressing the Twentieth Century (1990). The authors would like to thank an anonymous reviewer as well as Professors Stephen Hornsby and Anne Knowles of the University of Maine for their careful reading and insightful critique of this paper