l x x x v i E D I T O R I A L M E T H O D cited for such information. Endnotes are also used to correct factual errors in the text, to identify words or phrases given in dialect or in foreign languages, and to comment on textual problems such as confusing spelling, ambiguous prose, and il- legible passages. Corrections or emendations in a hand other than the author’s are omitted from the text, but included as endnotes if significant. In undated texts, an endnote to the bracketed dateline explains the dating. Edi- tors’ references to page numbers of documents reproduced in facsimile always re- fer to the original pagination. References to Einstein’s writings are cited by author and date (in case of papers these are given as the “permanent short title”), as well as by volume and document number. References to letters published in earlier volumes of The Collected Papers cite the names of author and recipient, the date, volume, and document number. Bibliographic references are cited by author and date (“short titles”). These ci- tations with full bibliographic information are listed alphabetically in the Literature Cited section at the end of each volume. This Literature Cited does not constitute a complete bibliography of all extant secondary works on Einstein. If a cited printed document is also in Einstein’s personal library, it is so noted.