Page "H. P. Lovecraft" Paragraph 32

Despite his light letter-writing in youth, in later life his correspondence was so voluminous that it has been estimated that he may have written around 30, 000 letters to various correspondents, a figure which places him second only to Voltaire as an epistolarian.

Lovecraft's later correspondence is primarily to fellow weird fiction writers, rather than to the amateur journalist friends of his earlier years.