The total 1861–63 manuscript consists of 23 notebooks (the pages numbered consecutively from 1 to 1472) running to some 200 printed sheets in length: it is the first systematically worked out draft — though still only rough and incomplete — of all four volumes of Capital. Theories of Surplus Value forms the longest (about 110 printed sheets) and most fully elaborated part of this huge manuscript, and it is the first and only draft of the fourth, concluding volume of Capital. Marx called this volume, as distinguished from the three theoretical volumes of Das Kapital, the historical, historico-critical, or historico-literary part of his work.[5]