1. 1. Documents from the Lithuanian State Central Archives (LCVA): Usinger, Hattendorff, Baumert (1933) Report from the Brandenburg province of the Berlin Oberprezident's office, L. u. 1119/33, Charlottenburgh
2. 2. LCVA, f. 383, ap. 7, b. 1471, 25-34. A. Gustaitis, V. Morkus, V. Reimontas and A. Gavelis (1933) The Act of the conclusions of the official investigation, compiled by a subcommittee led by the head of the technical department of the Lithuanian Air Force, Colonel Lieutenant A. Gustaitis. LCVA, f. 383, ap. 7, b. 1471, 49-54 (in Lithuanian). Appendixes I-IX held in the Private Archive (not specified by owners' will) (in German and Lithuanian). Related publications: G. Sviderskytė (2012) The 'lost' appendixes of the Act of the official investigation into the crash of the Lituanica. Naujasis židinys-Aidai, 7, pp. 478-483
3. 3. G. Sviderskytė (2013) The official investigations into the crash of the Lituanica in 1933: new facts and insights. Lietuvos istorijos studijos, 31, pp. 98-114. G. Sviderskyte (2014) Why the United States of America did not Investigate The Crash of the Lituanica? Legal and political aspects of the 'Darius & Girch' File. Istorijos šaltinių tyrimai, 5, pp. 195-211 (in Lithuanian).
4. The US Chargé d’Affaires ad interim in Kaunas Maurice L. Stafford provided explicit reports about the aftermaths of the Lituanica crash to the Department of State. In a Strictly Confidential note he implies that the Lithuanian government has not foreseen possible complications and had not projected concrete measures to be taken in regards of the widely desirable explanation and commemoration of the tragedy. He stated that ‘the investigation was ordered to satisfy the public demand’. United States National Archives RG 59, B5269, 811.79660M-DARIUS & GIRCH/ 24.