1. DMO/ADD/41/4/2 Reference (shelfmark): DMO/ADD/41/4/2 Title: Anti-Aircraft Defences for Defended Ports at Home. Printed for the Committee of Imperial Defence. March 1929. Secret.' '(Signed) L.E.H. Maund, Joint Secretary, Joint Oversea and Home Defence Committee. Collection Area: Map Collections Languages: English Date Range: 1927 Extent: 1 booklet (8p.) and 2 folios