Where Is Vulcan?

See:

Vulcan (mythology)
Vulcan (hypothetical planet)
Vulcan (Star Trek)
Myths Of Mercury
Vulcan's Forge
Vulcan's Forge II

World In Eclipse and Children Of The Void, the two Denis Grafton novels by William Dexter, have a fictional planet Vulcan and I now wonder whether I want to track down these two books to reread them as I recently did with Seed Of Light by Edmund Cooper.

Cooper and Dexter address Andersonian themes.

Later: The Denis Grafton novels have been ordered from Amazon so they might provide material for comparisons with Anderson.

Chain of thought:

space travel stories by Anderson;
"Vulcan's Forge";
Vulcan as a hypothetical or fictional planet;
William Dexter/Denis Grafton.