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In continental Europe, both original book-length stories such as The Ballad of the Salty Sea (1967) by Hugo Pratt or La rivolta dei racchi (1967) by Guido Buzzelli,[citation needed][5] and collections of comics have been commonly published in hardcover volumes, often called albums, since the end of the 19th century (including such later Franco-Belgian comics series as The Adventures of Tintin in the 1930s).