https://www.theguardian.com/artanddesign/2021/apr/13/tunnel-visionary-why-was-land-artist-nancy-holt-never-given-her-due
https://en.wikipedia.org/wiki/Nancy_Holt
http://www.nancyholt.com/holt.html
TRAIL MARKERS:
https://holtsmithsonfoundation.org/trail-markers
STONE RUIN TOUR I:
https://holtsmithsonfoundation.org/stone-ruin-tour-i
LIGHT AND LANGUAGE:
https://www.lismorecastlearts.ie/nancyholt/