five 1920s pamphlets issued by the Board of Trade. as detailed below:
Tables of Freeboard (circular 1485), revised June 1925.
Surface Ventilation of Coal Cargoes (circular 1641), December 1922.
Coal-Carrying Vessels (circular 1665), September 1927.
Deck Sheathings for Cargo and Passenger Ships (circular 1671), June 1928.
Simultaneous Use of Coal and Oil Fuel (circular 1677), August 1929
