Palace of Versailles campaigns, expenses for Versailles became more of a matter for public record, especially after Jean-Baptiste Colbert assumed the post of finance minister. Expenditures on Versailles have been recorded in the compendium known as the "Comptes des bâtiments du roi sous le règne de Louis XIV" and which were edited and published in five volumes by Jules Guiffrey in the 19th century. These volumes provide valuable archival material pursuant to the financial expenditure on all aspects of Versailles such as the payments disbursed for many trades as varied as artists and mole catchers. To counter the costs of Versailles during the
History of the Palace of Versailles but was never finished due to the king's death. Significant among Louis XV's contributions to Versailles were the "petit appartement du roi"; the "appartements de Mesdames", the "appartement du dauphin", the "appartement de la dauphine" on the ground floor; and the two private apartments of Louis XV – "petit appartement du roi au deuxième étage" (later transformed into the "appartement de Madame du Barry") and the "petit appartement du roi au troisième étage" – on the second and third floors of the palace. The crowning achievements of Louis XV's reign were the construction of the Opéra and the Petit Trianon.