For a useful overview of boat levels, in three related articles, try:
Roberts, Peter K., ‘Canal Tunnels Associated with Mineral Exploitation’,
Industrial Archaeology Review, V, 1 (1980-81), 5-14
Roberts, Peter K., ‘Boat Levels Associated with Mining: I. Coal Mining’,
Industrial Archaeology Review, V, 2 (1981), 85-95.
Roberts, Peter K., ‘Boat Levels Associated with Mining: II. Metal Mining’
, Industrial Archaeology Review, V, 3 (1981), 203-16.
Yours
Stafford
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