Although not formalised and acknowledged as a mythos per se, Lovecraft did correspond with contemporary writers ( Clark Ashton Smith, Robert E. Howard, Robert Bloch, Frank Belknap Long, Henry Kuttner, and Fritz Lieber – a group referred to as the " Lovecraft Circle ") – and shared story elements: Robert E. Howard's character Friedrich Von Junzt reads Lovecraft's Necronomicon in the short story " The Children of the Night " ( 1931 ), and in turn Lovecraft mentions Howard's Unaussprechlichen Kulten in the stories " Out of the Aeons " ( 1935 ) and " The Shadow Out of Time " ( 1936 ).

Derleth expanded the boundaries of the Mythos by including any passing reference to another author's story elements by Lovecraft as part of the genre: just as Lovecraft made passing reference to Clark Ashton Smith's Book of Eibon, Derleth in turn added Smith's Ubbo-Sathla to the Mythos.

Clark Ashton Smith ( 13 January 1893 – 14 August 1961 ) was a self-educated American poet, sculptor, painter and author of fantasy, horror and science fiction short stories.

With studied playfulness, Smith and Lovecraft borrowed each other's coinages of place names and the names of strange gods for their stories, though so different is Smith's treatment of the Lovecraft theme that it has been dubbed the ' Clark Ashton Smythos '.

Clark Ashton Smith was the third member of the great triumvirate of Weird Tales, with Lovecraft and Robert E. Howard.

Many examples are reproduced in Dennis Rickard's The Fantastic Art of Clark Ashton Smith ( Baltimore, MD: The Mirage Press, 1973 ).

* The Collected Fantasies of Clark Ashton Smith 5-volume work

* The Complete Poetry and Translations of Clark Ashton Smith ( 3 vols )

* The Last Oblivion: Best Fantastic Poems of Clark Ashton Smith

* The Shadow of the Unattained: Letters of George Sterling and Clark Ashton Smith

* The Freedom of Fantastic Things: Selected Criticism on Clark Ashton Smith

* The Black Book of Clark Ashton Smith

* Selected Letters of Clark Ashton Smith

* Smith, Clark Ashton.

* List of works by Clark Ashton Smith

" Collecting Clark Ashton Smith ".

“ Clark Ashton Smith: Beauty Is for the Few ,” chapter 2 in Emperors of Dreams: Some Notes on Weird Poetry.

" The Clark Ashton Smythos " in Price, Robert M. ( ed ).

Clark Ashton Smith.

The Tales of Clark Ashton Smith: A Bibliography.

The Freedom of Fantastic Things: Selected Criticism on Clark Ashton Smith.

* Haefele, John D. " Far from Time: Clark Ashton Smith, August Derleth, and Arkham House.

* Lost Worlds: The Journal of Clark Ashton Smith Studies, Seele Brennt Publications.

Special Clark Ashton Smith issue, 96 pp. ( 1973 )

Selected Letters of Clark Ashton Smith.

The Shadow of the Unattained: The Letters of George Sterling and Clark Ashton Smith.

Emperor of Dreams: A Clark Ashton Smith Bibliography.

* 1770 – William Clark, American soldier, explorer, and politician ( d. 1838 )

* 1909 – Walter Van Tilburg Clark, American novelist ( d. 1971 )

* 1943 – Denis Payton, English saxophonist ( The Dave Clark Five )

* 1975 – Keon Clark, American basketball player

* 1783 – William Tierney Clark, English engineer, designed the Hammersmith Bridge ( d. 1852 )

* 1803 – Lewis and Clark start their expedition to the west by leaving Pittsburgh, Pennsylvania at 11 in the morning.

* 1962 – Clark Gregg, American actor

* 1973 – Brady Clark, American baseball player

The Lewis and Clark Expedition spent the winter of 1805 – 1806 at Fort Clatsop, a small log structure south and west of modern day Astoria.

* 1953 – Operation Moolah is initiated by General Mark W. Clark against Communist pilots.

* 1965 – Teenage sniper Michael Andrew Clark kills three and wounds six others shooting from a hilltop along Highway 101 just south of Santa Maria, California.

* 1805 – Lewis and Clark Expedition: The Corps of Discovery breaks camp among the Mandan tribe and resumes its journey West along the Missouri River.

* 1968 – Jim Clark, Scottish race car driver ( b. 1936 )

* 1942 – Dave Clark, English musician ( The Dave Clark Five )

* 1975 – Jerrelle Clark, American wrestler

* 1982 – At the University of Utah, Barney Clark becomes the first person to receive a permanent artificial heart.

* 2003 – Clark Kerr, American academic ( b. 1911 )

* 1927 – Mary Higgins Clark, American author

* 1920 – Clark Terry, American trumpeter

* 1979 – The Canadian Government of Prime Minister Joe Clark is defeated in the House of Commons, prompting the 1980 Canadian election.

* 1973 – Christie Clark, American actress