• P750423
    • Slate. Quarry at Harburton Ford, Devon...
    • P750424
    • Slate. Quarry at Harburton Ford, Devon...
    • P750425
    • Slate. Quarry at Harburton Ford, Devon...
    • P750426
    • Slate. Quarry at Harburton Ford, Devon...
    • P750427
    • Slate. Quarry at Harburton Ford, Devon...
    • P750428
    • Slate. Quarry at Harburton Ford, Devon...
    • P750429
    • Grey slate. 3/4 miles E. Tavistock,...
    • P750430
    • Grey slate. 3/4 miles E. Tavistock,...
    • P750431
    • Slate (roofing). Coryton Quarry,...
    • P750432
    • Slate. Coryton Slate Quarry, Lewdown,...
    • P750433
    • Slate. Coryton Slate Quarry, Lewdown,...
    • P750434
    • Slate. Coryton Slate Quarry, Lewdown,...
    • P750435
    • Slate. Quarry, near Wistland Pound,...
    • P750436
    • Slate. Eastcott down Plantation,...
    • P751536
    • Slate. 1.5 miles SSE. of Ashburton,...
    • P751537
    • Roofing Slate. Coryton Quarry, Coryton,...
    • P751538
    • Slate. Challacombe, North Devon. Econ....