In recent decades, exhibition catalogues have grown to prodigious sizes and may be the most comprehensive sources for even rather large subject areas. Probably the largest to be produced were in the 1970s in a competitive spree by Italian provinces and German lander to promote the significance of their region by mounting huge exhibitions on the period when its cultural production was at its peak. A typical example is the three-volume "Die "Parler" und der schöne Stil 1350-1400. Europäische Kunst unter den Luxemburgern" from Cologne of 1978, with a further two volumes published in 1980 on a colloquium held in conjunction with the exhibition. The three volumes covering the exhibition proper amount to over a thousand pages and it would have been unfeasible to have taken them into the exhibition itself. Another example is "The History of Japanese Photography," 432 pages long and with over four hundred plates.