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/usr/share/sgml/html/entities/catalog is in sgml-data 2.0.10.

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The actual contents of the file can be viewed below.

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OVERRIDE YES

        -- entities used by HTML v4 and others --
PUBLIC "-//W3C//ENTITIES Latin1//EN//HTML"                                      HTMLlat1.ent
PUBLIC "-//W3C//ENTITIES Special//EN//HTML"                                     HTMLspecial.ent
PUBLIC "-//W3C//ENTITIES Symbols//EN//HTML"                                     HTMLsymbol.ent
        -- compatability references, recommended by ISO/IEC 15445:2000 --
PUBLIC "-//W3C//ENTITIES Latin alphabet No. 1//EN//HTML"                        HTMLlat1.ent
PUBLIC "-//W3C//ENTITIES Full Latin 1//EN//HTML"                                HTMLlat1.ent
PUBLIC "-//W3C//ENTITIES Latin 1//EN//HTML"                                     HTMLlat1.ent
PUBLIC "-//W3C//ENTITIES Symbolic//EN//HTML"                                    HTMLsymbol.ent

        -- these are used by HTML v3 and derivitive DTDs --
        --   its best to use the W3C entities now --
PUBLIC "-//IETF//ENTITIES Added Latin 1 for HTML//EN"                           old-html-latin.ent

        -- fake HTMLicons reference --
PUBLIC "-//IETF//ENTITIES icons for HTML//EN"                                   old-html-icons.ent
        -- fake HTMLmath reference --
PUBLIC "-//IETF//ENTITIES Math and Greek for HTML//EN"                          old-html-math.ent