The "Dynamic Theory of Gravity" was one of two Teslas's discoveries, which he worked out in all details in the years 1893 and 1894.
More complete statements concerning these discoveries can only be gleaned from scattered and sparse sources, because the papers of Tesla are concealed in government vaults for national security reasons. These papers are located at the "National Security Research Center" now the "Robert J. Oppenheimer Research Center". These discoveries are denied access because they were classified, even though plans for the hydrogen bomb are on an open shelf and could be seen and copied.