Q. Proposed tunnel under the Thames, from Tilbury, co. Essex, to Gravesend, co. Kent, 1799. River Thames: Plans of proposed tunnel from Tilbury to Gravesend: 1799.
R. Proposed tunnel under the Thames, from Tilbury, co. Essex, to Gravesend, co. Kent, 1799. River Thames: Plans of proposed tunnel from Tilbury to Gravesend: 1799.