• WSL: Westcountry Studies Library, Exeter
• BAR: Barnstaple Local Studies Library

Gazetteer: selecting a place offers a lead to the relevant section of the Donn map A guide to using maps as an historical resource.
Early Exeter town maps from 1587 to the 20th century
Dawlish Warren in maps
German military intellegence documents includes maps and aerial photographs

A date listing of Devon map coverage

1575. Saxton's map Devon Libraries Local Studies Service
1765. Donn's map.Devon Libraries Local Studies Service
1785-1803. Ordnance Survey surveyors drawings 1785-1803 Collect Britain
1809. Ordnance survey one inch map, Vision of Britain
1827. Greenwood's map Devon Libraries Local Studies Service
c1890. First edition 1:10,560 Ordnance Survey, Landmark and Ordnance Survey
1930s. Land use one inch maps, Vision of Britain
1948. Parish boundary on 1948 one inch outline map Genuki
c1948. Ordnance survey one inch, Vision of Britain
Current Ordnance Survey Landranger 1:50,000, Landmark and Ordnance Survey
Current. Ordnance Survey Landranger 1:50,000 Ordnance Survey Get a Map
Current. Ordnance Survey Landranger mapping (1:50,000) Streetmap
Current. Ordnance Survey Explorer 1:25,00 Ordnance Survey Get a Map
Current. Ordnance Survey 1:10,000 with public rights of way Devon County Council Public rights of way
Current. Street mapping 1:5,000 Google Maps
Current. Street mapping 1:5,000 Streetmap
Current. Street mapping to 1:5,000 Multimap

Other web pages useful for local and historical mapping.
A round-up of national and international digital projects concerning early mapping includes references to:

Maps of Plymouth (fairly high res. maps, plans and extracts, 16th-19th century - Steve Johnson)

Dorset Coast Digital Archive (select Interactive maps or Image Library, then Search - [entering "map" into Basic Search finds 890 medium resolution images, of tithe and other maps, 18th-20th centuries])

Collect Britain project of the British Library:
1. Crace Collection of maps of London
2. Ordnance Surveyors’ Drawings
3. 3,000 drawings, watercolours and aquatint views from the King George III's topographical collection
4. about 500 images of maps, from 800-1620, of the British Isles and its parts

Charles Booth. The papers of Charles Booth, his family, and his survey into life and labour in London.

England. History of cartography research at the University of Exeter. Projects, each with their own short web page:
Tithe maps
Enclosure and rating, parochial asessment, sanitary and drainage maps
Boundaries of historic (pre-1850) parishes and townships of England and Wales
Ordnance Survey
British Town Maps, 1470-1895: A Catalogue and Cartographical Analysis
Maps and History in South-West England
Cadastral maps in the service of the state: a history of property mapping
Historical Atlas of South-West England
English maps: a history.

UKBORDERS On-Line. Digital Boundary Data (Edinburgh University). 'United Kingdom Boundary Outline and Reference Database for Education and Research Study'. This a web-based Interface that provides digitised boundary datasets of the UK, available in many GIS formats for users to download.

Images of early maps on the web: 12b. British Isles includes:

British Isles (Seven medium resolution, slow-loading, maps, 1616-1830 - Yale University Library. One for England and Wales 1767 but none for Devon).

British Isles (a selection, mostly of 19th century county maps, of England, Ireland, Scotland, Wales, and London, in high resolution. Devon map: Report of the Boundary Commissioners for England and Wales. Printed by Eyre and Spottiswoode, London, 1885. - London Ancestor)

'European Cities' (12 high resolution but slow-loading city plans - mostly from the British Isles including Bath 1676 but no Devon as yet - Yale University Library)

John Speed Theatre of the Empire of Great Britaine. high res. images (enlargeable or with pre-selected details) of three of the maps (England and Wales, but not Devon yet), 29 cities Bath, Dorchester Gloucester in South West and towns, title-pages, and map details (heraldry, coins, costume by rank, buildings, royalty, stones - Maryanne Cline Horowitz)

Towns. 'Historic Maps' (links to medium resolution images, (including Exeter from Speed's map) illustrating a brief summary of the history of British town mapping - Jean Manco, Sources for Building History)

England (seven county maps, 1878-88, from the Encyclopedia Britannica, enlargeable to high resolution Cornwall, Gloucestershire and Wiltshire in South West - Malcolm Farmer)

Tom's big chest of old English maps includes Devon by John Carey c.1787. - Tom Courtney)

England. ‘Medieval boroughs (John Speed, c.1610)’ (high res. images of Colchester, Exeter, Hull, Leicester, Norwich, Nottingham and York) - University of Leicester, English Local History)

South Coast Harbours 1698 (a facsimile of the report by Edmund Dummer and Thomas Wiltshaw, comprising 18 charts with text (all enlargeable to high res.) of the coast from Dover to Land’s End, including transcripts of all notes on the charts, and with key letters on the charts treated as hotspots with ALT text explanation, and with a wide range of illustrated notes on chart features. Includes Exmouth and Dartmouth in Devon - Jean and Martin Norgate, with notes by Adrian Webb, 2002)

Your Old Maps Online (assorted maps and plans, arranged by counties, much enlarged, very high res. - a constantly growing site. For Devon includes: Devonshire - North 1904, Bacon's Popular Atlas of the British Isles. Devonshire - South 1904, Bacon's Popular Atlas of the British Isles. Devon 1787 Cary, Plymouth Sound 1868, Plymouth Sound 1890.