- Bench Mark Database
- British Cartographic Society
- Canadian Cartographic Association weblog
- Confluence.org Latitude and longitude integer degree intersections
- COPAC Libraries catalogue
- Defence Surveyors Association
- David Rumsey Map Collection
- Geograph British Isles (a photograph from every grid square)
- Geonames Geographic names database
- Map Curators Toolbox
- Map History / History of Cartography ‘The Gateway to the Subject’
- Ordnance Survey Summary Lists
- Petrol Maps Oil company maps of Europe
- Road Map Collectors Association (USA)
- Royal Geographical Society
- SovietMaps.com Soviet Military mapping of Britain
- Trigpointing UK
- World Subways Diagrams of metro systems at the same scale
- OrdnanceMaps maps discussion group
