"Lockheed Aircraft Corporation." . . . . . . . "Lockheed annual report"@en . "Lockheed annual report" . . . . . . . . . . . . "Annual report"@en . "Annual report" . . . . "Form 10-K" . "[Annual report to the Securities and Exchange Commission]" . "Annual report of the president"@en . . "Annual report of the president" . "Periodicals"@en . "Periodicals" . . . . "Annual report - Lockheed Corporation"@en . . . . . . . . "Corporation reports"@en . .