My Ancestor Was a Merchant Seaman. How can I find out more about him?

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First published 1986. Second edition 2002. Written for genealogical research but with much of relevance for other researchers in maritime history with sections on: 'Trade and taxation' [port books, shipping returns, customs records]; 'Legal disputes'; 'Agreements, crew lists and log books'; LLoyd's Marine Collection; 'Registers of shipping'