Times in 1899, Twain was reported to be considering a work which would be unpublished for a century. Twain wrote instructions for future "editors, heirs and assigns" in 1904. In these he celebrates that posthumous publication allowed him to speak with his "whole frank mind." These also outlined a century-long plan of publications 25 years apart, with progressively more potentially controversial material included. In the introduction to the second edition of Mark Twain's Own Autobiography: The Chapters from the North American Review, the scholar Michael Kiskis suggests that these delays were less due to Twain's (purported) concern for those who could be aggrieved by the text, and more likely an attempt to extend the copyright. Various modern reports refer to a "100 year embargo" imposed by Twain on his own autobiography's release which expired in 2010. 20th century publications Twain himself had published Chapters from My Autobiography in twenty-five instalments in the North American Review in 1906-7. Since Twain's death in 1910, a number of different editors have made attempts to impose some order on the whole of the material by selection and reorganization, producing several decidedly different published versions of The Autobiography. Creating a publishable Autobiography from the disorganised mass of Twain's unpublished writings has proven to be a significant challenge, and access to the physical materials of Twain's papers was, for the first half-century, greatly limited to just small numbers of scholars. The partial Autobiography was published in 1924 by Harper & Brothers, consisting of about two-fifths of the material. It was compiled by personal friend and literary executor Albert Bigelow Paine, who at the time had exclusive access to Twain's papers. Editor and historian Bernard DeVoto succeeded Paine as literary executor for the Clemens estate, and used his access to the material to produce four book collections of Autobiography material: Mark Twain in Eruption (1940), The Portable Mark Twain (1946), Mark Twain at Work (1952), and Letters from the Earth (1962). The much-delayed publication of the latter was due to objections from Clara Clemens. Two publications were made from re-arrangements of previously published work. In 1959 Charles Neider rejected both Paine's in-order-of-creation and DeVoto's arranged-by-topic approaches and rearranged material to match the chronology of a standard autobiography. In 1990 (republished February 2010) scholar Michael Kiskis edited Mark Twain’s Own Autobiography: The Chapters from the North American Review. Mark Twain Project edition The Mark Twain Project of The