Georges Gurdjieff —
Photo Credit: By Janet Flanner-Solita Solano papers. - https://www.loc.gov/pictures/item/95507085/, Public Domain, https://commons.wikimedia.org/w/index.php?curid=8026263

Blavatsky's birthplace — Illustration of Yekaterinoslav, Russia Empire— now Dnipro, Ukraine—as it appeared in the early 19th century
Photo Credit: By Unknown - [1], Public Domain, https://commons.wikimedia.org/w/index.php?curid=8695071

HP Blavatsky —
Photo Credit: By Unsure - http://www.blavatskyarchives.com/hpbphotos6.htm, Public Domain, https://commons.wikimedia.org/w/index.php?curid=66334

Polk Inauguration — as shown in the Illustrated London News, v. 6, April 19, 1845
Photo Credit: By Illustrated London News, v. 6 - From the Library of Congress, Public Domain, https://commons.wikimedia.org/w/index.php?curid=46622310

James Knox Polk — Polk's official White House portrait, by George Peter Alexander Healy, 1858
Photo Credit: By George Peter Alexander Healy - The White House Historical Association, Public Domain, https://commons.wikimedia.org/w/index.php?curid=10288056

Tyler's birthplace — Greenway Plantation, Charles City County, VA
Photo Credit: By Unknown - http://memory.loc.gov/pnp/habshaer/va/va0300/va0309/photos/160346pv.jpg, Public Domain, https://commons.wikimedia.org/w/index.php?curid=12310192

John Tyler —
Photo Credit: By The Bureau of Engraving and Printing - Restoration by Godot13, Public Domain, https://commons.wikimedia.org/w/index.php?curid=33963339

Tyler Receives News of Harrison's Death — 1888 illustration of President Tyler receiving the news of President Harrison's death from Chief Clerk of the State Department Fletcher Webster By Illustrated in Stoddard, William Osborn, 1835-1925. The Lives of the Presidents, v. 5, New York: Frederick A. Stokes & Brother, 1888, between pp. 12-13
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=5773423

William Henry Harrison — 1841
Photo Credit: By Bass Otis - Christie's, LotFinder: entry 5352648, Public Domain, https://commons.wikimedia.org/w/index.php?curid=11357154

Martin Van Buren —
Photo Credit: By Daniel Huntington (1816-1906) - http://www.hallofgovernors.ny.gov/MartinVanBuren, Public Domain, https://commons.wikimedia.org/w/index.php?curid=25808703

John Quincy Adams —
Photo Credit: By Gilbert Stuart - xgHk44ObGXYAWw at Google Cultural Institute maximum zoom level, Public Domain, https://commons.wikimedia.org/w/index.php?curid=21881910