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The Henry Draper catalogue Extension is an extension to the famous Henry Draper Catalogue, a collection of positional and spectroscopic data about hundreds of thousands of stars.

It can be recognized by the prefix HDE, followed by a number indicating the star's position in the catalogue.

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List of ships of the United States Navy

... (CVE 60) USS Guam[?] (CB 2) USS Guardfish[?] (SSN 612) USS Haddo[?] (SSN 604) USS Haddock[?] (SSN 621) USS Halibut (SS 232, SSN 587/SSGN 587) USS ...