Map showing the percentage of Jews in the <a href="https://en.wikipedia.org/wiki/Pale_of_Settlement" class="extiw" title="w:Pale of Settlement">Pale of Settlement</a> and <a href="https://en.wikipedia.org/wiki/Congress_Poland" class="extiw" title="w:Congress Poland">Congress Poland</a> (Original caption without the red line).
<dl><dt>Citations</dt></dl><ol><li>YIVO Encyclopedia, <a rel="nofollow" class="external text" href="http://www.yivoencyclopedia.org/article.aspx/Pale_of_Settlement">"The Pale did not include the provinces of the Russian-controlled Congress Poland."</a></li>
<li>JewishFamilySearch.com, <i><a rel="nofollow" class="external text" href="http://jewishfamilysearch.com/pale-of-settlement/">"Congress Poland did not belong to the Pale of Settlement."</a></i></li>
<li>Jewish Virtual Library, <i><a rel="nofollow" class="external text" href="http://www.jewishvirtuallibrary.org/the-pale-of-settlement">"Vistula Region (lands of Congress Poland) was not officially included within the Pale of Settlement."</a></i></li>
<li>A.S. Lindemann (1997 book, page 61), <i>"Technically, Congress Poland was not part of the Pale (a point not often understood), but most of the <u>extensive territories to the east and south of Congress Poland</u>, once ruled by Poland (Lithuania, Byelorussia, the Ukraine), were included in it."</i>  <a href="//commons.wikimedia.org/wiki/Special:BookSources/0521795389" title="Special:BookSources/0521795389">ISBN 0521795389</a></li></ol>
Not specified in source.
1905
<cite class="book" style="font-style:normal">Herman Rosenthal; J.G. Lipman; Vasili Rosenthal; L. Wygodsky; M. Mysh; Abraham Galante (1905) "Russia" in    <i> <a rel="nofollow" class="external text" href="http://www.jewishencyclopedia.com/articles/12943#anchor24">The Jewish Encyclopedia: Vol. 10, Philipson–Samoscz</a></i>, New York, N.Y.:  <a href="https://en.wikipedia.org/wiki/Funk_%26_Wagnalls" class="extiw" title="w:Funk &amp; Wagnalls">Funk &amp; Wagnalls</a>, pp. 531  <small></small></cite>