Trinity Site 1945–1995: A National Historic Landmark is an official history-and-visitor booklet for the Trinity Site at White Sands Missile Range, New Mexico, marking fifty years since the first atomic bomb test on July 16, 1945. It recounts the Manhattan Project work that led to the “Gadget” detonation, explains how the test was conducted, and describes the immediate aftermath and long-term significance of the event. The book also covers the site’s preservation and National Historic Landmark designation, what remains on the ground today (including the Ground Zero monument and associated artifacts), and provides practical information about access, site rules, and safety considerations for visitors.