Map accompanying the <a href="https://en.wikisource.org/wiki/en:1911_Encyclop%C3%A6dia_Britannica/Oregon" class="extiw" title="wikisource:en:1911 Encyclopædia Britannica/Oregon"><i>Oregon</i> article in the 1911 Encyclopedia Britannica</a>.
1911 Encyclopedia Britannica
1911
<a class="external free" href="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/EB1911_-_Volume_20.djvu/page265-1984px-EB1911_-_Volume_20.djvu.jpg">http://upload.wikimedia.org/wikipedia/commons/thumb/c/c6/EB1911_-_Volume_20.djvu/page265-1984px-EB1911_-_Volume_20.djvu.jpg</a> and <a rel="nofollow" class="external free" href="https://archive.org/details/encyclopdiabri20chis">https://archive.org/details/encyclopdiabri20chis</a> (HTTP file, orig_jp2 files)