TY - GEN AU - Naumann, Eugene C. AU - Mixson, John S. TI - NASA TN [D-6557]: VIBRATION CHARACTERISTICS OF Z-RING-STIFFENED 60 (DEGRE) CONICAL SHELL MODELS OF A PLANETARY ENTRY SPACECRAFT PY - 1971/// PB - Nasa, Washington, D.C. KW - Aerodynamics N1 - NASA Technical Note D-6552,53,57,63,68 Bounded Volumes Accession No. 101251; Contents: TR13142-46 ER -