CREATE TABLE table_37103 ("Name" CLOB, "Birth" CLOB, "Marriage" CLOB, "Became Duchess" CLOB, "Ceased to be Duchess" CLOB, "Death" CLOB, "Spouse" CLOB)

What is the marriage date for the Habsburg-Lorraine house member who died 29 December 1829?
SELECT "Marriage" FROM table_37103 WHERE "Death" = '29 december 1829'
SELECT "Marriage" FROM "table_37103" WHERE "Death" = '29 december 1829'