Soviet photobooks of 1920–1930-ies are among the most significant phenomena in the world history of photobooks of the 20th century. Today their artistic and printing qualities, along with advanced design are highly appreciated by the researchers of books and photography. This was not always the case, however. The discovery of this material, forgotten and unclaimed for decades, began only in the late 90-ies. Exhibition "The USSR is building socialism. Masterpieces of the Sovi…