The original title for the records was "The Official Records of the War of the Rebellion" and they were later renamed "The War of the Rebellion: a Compilation of the Official Records of the Union and Confederate Armies", which has led to some lasting controversy over the official name for the war. As finally published, the records consist of 138,579 pages with 1,006 maps and diagrams assembled in 128 books, organized as 70 volumes grouped in four series, published between 1881 and 1901. Each of the four series of books in the compilation is divided into "volumes" numbered from the beginning of the series with Roman numerals. In series II, III, and IV each "volume" coincides with a book. In series I, however, it was found to be usually impracticable, beginning with volume X, to confine "volumes," as units of content, within single books. Volume X and most subsequent volumes in series I were therefore issued in "parts" distinguished by subsidiary Roman numerals, each occupying a separate book. Beginning with volume XXIV, Arabic "serial numbers" were also printed on the backs of the books issued, although these numbers were not included on the title pages, and are therefore not universally used in citations.