What year was H.P. Lovecraft's novella "At the Mountains of Madness" published and was the first appearance of The Elder Things?
Elder Thing:  The beings first appeared in H. P. Lovecraft's novella, "At the Mountains of Madness" (published in 1936, but written in 1931), and later appeared, although not named, in the short story "The Dreams in the Witch-House" (1933). At the Mountains of Madness:  It was originally serialized in the February, March, and April 1936 issues of "Astounding Stories".
1936