Prison Entrepreneurship Program

https://babel.hathitrust.org/cgi/pt?id=gri.ark:/13960/t84j4q44p

https://archive.org/details/plasterandplast00hodggoog

https://www.buildinglimesforum.org.uk

https://preservationscience.wordpress.com/2013/10/02/blue-ridge-mortarmaking/ This is a blog by Jon, the expert I had mentioned over the phone.