1. David Rumsey historical map collection Author/Creator: Cartography Associates Publication/Creation: [Place of publication not identified] : Cartography Associates, 2003- Format: Map Access & Availability: Loading
2. Digital nautical chart (DNC). Author/Creator: United States. National Geospatial-Intelligence Agency Publication/Creation: [Bethesda. MD] : National Geospatial-Intelligence Agency, 2011- Format: Map Access & Availability: Loading