The Shadow over Innsmouth
Lovecraft first mentioned Arkham's Miskatonic University in "Herbert West–Reanimator", written in 1921–22. He added Dunwich to his imaginary landscape in 1928's "The Dunwich Horror", and expanded it to include Innsmouth in 1931's "The Shadow over Innsmouth". Other Lovecraft stories that make use of Lovecraft Country settings include "The Festival", "The Colour out of Space", "The Strange High House in the Mist", "The Dreams in the Witch House", and "The Thing on the Doorstep".