Lecture notes, Royal Naval College, Greenwich.
Lecture notes, 1924-5, of Sir Thomas Hope Troubridge (1895-1949) while at the Royal Naval College, Greenwich, includes 'Naval Intelligence Organization' by Major W Sinclair, R.M., 'Intelligence 4: Information Required' also by Major Sinclair, 'Intelligence V, Confidential Books, Handling of Messages' by Major Sinclair, 'Maps and Map Reading' two copies by Sinclair, 'A Staff Officer's Cypher', 'Senior Division 1930. Propaganda in War'.