Picture of the Radcliffe Camera by Lies Thru a Lens(Radcliffe Camera, Oxford Uploaded by tm) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Picture of portion of a parchment leaf from a liturgical ms., probably an antiphonary, containing text and music for the first words of the antiphon for the first psalm sung at vespers on the vigil of the solemnity of the Ascension (6695330439).jpg by kladcat [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons
Picture of Monopoly "Go" square by William Warby - https://www.flickr.com/photos/wwarby/11513424364 [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0/)], via Flickr
Reference Management Tag Cloud generated by Wordle - http://www.wordle.net/
Picture of footnotes by Hedwig von Ebbel - https://commons.wikimedia.org/wiki/File:Footnotes.jpg?uselang=en-gb [CC-BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons
Picture of Scrabble tiles spelling the word "Letters" by MorningbirdPhoto - https://pixabay.com/en/letters-word-scrabble-tiles-539709/ [CC0 (https://creativecommons.org/publicdomain/zero/1.0/)], via pixabay
Picture of an open gate in shadow by jingoba - https://pixabay.com/en/gate-door-court-shadow-open-229024/ [CC0 (https://creativecommons.org/publicdomain/zero/1.0/)], via pixabay
Picture of a microscope by Dodgerton Skillhause - http://www.morguefile.com/archive/display/924051[http://www.morguefile.com/license/morguefile], via morgueFile
Green and yellow envelopes icon by Harwen - http://www.iconarchive.com/show/pleasant-icons-by-harwen/E-mail-icon.html ["Free for non-commercial use"], via IconArchive