Langdon's book, The Lost Caravel, was published in June 1975 by Pacific Publications Pty Ltd, Sydney. The book puts forward the theory that the crew of a Spanish ship, the caravel San Lesmes, lost in the eastern South Pacific in 1526, played a prominent role in the prehistory of several Polynesian islands, including the Tuamotu Archipelago, Society Islands, Austral Islands, Easter Island and New Zealand. The San Lesmes was one of the ships of the expedition of Garcia Jofre de Loaisa which left Spain in July 1525 to obtain a cargo of spices in the East Indies.

Correspondence relating to research and other matters leading to the publication of The Lost Caravel. On the microfilm, the correspondence is preceded by a chronological list of letters from the author to individuals and institutions. The correspondence is microfilmed in alphabetical order in two sections: individual correspondence and institutions. Each section is preceded by a calendar.<BR>For original documents relating to the Loaisa expedition see PMB 135-140. See also PMB 999