Her work during the war was classified by the Official Secrets Act 1939 so much of her work was not revealed during her lifetime.
The Official Secrets Acts 1911 to 1939 means the Official Secrets Acts 1911 and 1920 and the Official Secrets Act 1939.
Act of Parliament | Act | Statute Law Revision Act 1948 | Statute Law Revision Act 1888 | Act of Congress | 1939 | The Wizard of Oz (1939 film) | Reform Act 1832 | Patient Protection and Affordable Care Act | Endangered Species Act | Digital Millennium Copyright Act | Clean Water Act | American Recovery and Reinvestment Act of 2009 | 1939 New York World's Fair | National School Lunch Act | Statute Law Revision Act 1863 | Criminal Justice Act 1988 | Local Government Act 1972 | Americans with Disabilities Act of 1990 | Racketeer Influenced and Corrupt Organizations Act | Invasion of Poland (1939) | Communications Act 2003 | Statute Law Revision Act 1887 | Consumer Credit Act 1974 | ACT | Stamp Act | Official Secrets Act 1989 | National Firearms Act | act | Statute Law Revision Act 1867 |