Spy sites of New York City

Author: Melton, H. Keith (Harold Keith), 1944-, Wallace, Robert,, Schlesinger, Henry R.,
Published 2012

Spy sites of Philadelphia

Author: Melton, H. Keith (Harold Keith), 1944-, Wallace, Robert,, Schlesinger, Henry R.,
Published 2013

Spy sites of Washington, DC : a guide to the capital region's secret history

Author: Wallace, Robert (Retired intelligence officer),, Melton, H. Keith (Harold Keith), 1944-, Schlesinger, Henry R.,
Published 2017

Spy sites of Philadelphia : a guide to the region's secret history

Author: Melton, H. Keith (Harold Keith), 1944-, Wallace, Robert (Retired intelligence officer)
Published 2021