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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 rare diseases starting with H

... 2[?] Hyperoxaluria[?] Hyperparathyroidism, familial, primary[?] Hyperparathyroidism, neonatal severe primary[?] Hyperparathyroidism[?] Hyperphalangism dysmorphy ...