"Lovecraft Circle" Myth Cycles

On the Lovecrafts fandom wiki i read that:

Traditionally, the "Lovecraft Circle" members and their direct contributions are limited to:
-Robert Bloch (12 short stories)
-Clark Ashton Smith (8 short stories and 1 poem)
-Robert E. Howard (7 short stories and 1 poem)
-Frank Belknap Long (2 short stories and 1 novel)
-August Derleth (34 short stories and 1 novel)

And having read all that i found which he himself wrote, was happy to find there is more that he gave a direct nod towards, but beside having them and their amount of works mentioned i could not find which of their works are part of the circle;
So i ask, do any of You know which?