It's at
machen_review_of_clark_ashton_smith. I found it thanks to the built-in search engine of the Eldritch Dark (top of the page). But a Google search could have lead you there too: they have a very useful tool in the "extended search" section that enables visitors to search for a word within a specific domain or website. Quite useful when the site has no search engine.
Bests,
Philippe Gindre