Yes Tor Range Warden's Shelter

UK Government Web Archive

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This Page is [ARCHIVED CONTENT] and shows what the site page http://www.mod.uk/NR/rdonlyres/EBF59C8C-8B0E-4349-B40B-B6566B658959/0/Okehampton_Artillery_Range_Observation_Posts.pdf looked like on 26 Oct 2012 at 06:52:14
https://webarchive.nationalarchives.gov.uk/20121026065214/http://www.mod.uk/NR/rdonlyres/EBF59C8C-8B0E-4349-B40B-B6566B658959/0/Okehampton_Artillery_Range_Observation_Posts.pdf