COMPD_CS["NAD27 + NGVD29 height (ftUS)",
    GEOGCS["NAD27",
        DATUM["North_American_Datum_1927",
            SPHEROID["Clarke 1866",6378206.4,294.978698213898,
                AUTHORITY["EPSG","7008"]],
            AUTHORITY["EPSG","6267"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4267"]],
    VERT_CS["NGVD29 height (ftUS)",
        VERT_DATUM["National Geodetic Vertical Datum 1929",2005,
            AUTHORITY["EPSG","5102"]],
        UNIT["US survey foot",0.304800609601219,
            AUTHORITY["EPSG","9003"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","5702"]],
    AUTHORITY["EPSG","7406"]]