Lockheed Martin Corporation https://www.gov/Archives/edgar/data/936468/000093646819000009/lmtq4201810k.htm Excel Ratio File spreadsheet:

https://www.sec.gov/Archives/edgar/data/936468/000093646819000009/lmtq4201810k.htm

https://www.sec.gov/reportspubs/investor-publications/investorpubsbegfinstmtguidehtm.html

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