Duchy of Cornwall. Account of income and expenditure, for the year 1850. Parliamentary Papers, 1851, p.19, 19.
Duchy of Cornwall. Account of income and expenditure, for the year 1851. Parliamentary Papers, 1852, p.31.
Duchy of Cornwall. Account of income and expenditure, for the year 1852. Parliamentary Papers, 1853, p.29.
Duchy of Cornwall. Account of income and expenditure, for the year 1853. Parliamentary Papers, 1854, p.29.
Duchy of Cornwall. Account of income and expenditure, for the year 1854. Parliamentary Papers, 1855, p.29.
Mineral Statistics List of Clay Works 1868-1874.