<https://newyorkschooltalk.org/2016/12/letters-john-prison-education-high-school-hard-knocks/#webpage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://newyorkschooltalk.org/2016/12/letters-john-prison-education-high-school-hard-knocks/>