SSW: June 1943: UNKNOWN WORLDS;; July 1943: WEIRD TALES, FANTASTIC ADVENTURES, SCIENCE FICTION (previously FUTURE FANTASY AND SCIENCE FICTION); September 1943: FAMOUS FANTASTIC MYSTERIES--stories from 1943 US fantasy fiction magazines:

A snapshot/slice of a time long past...notable that the most famous story in this issue of Weird Tales would be the most famous and among the most influential stories to be published in any of the issues cited here, one which posits that "Jack the Ripper" has found a means of achieving literal immortality through his crimes. Got a top-line banner, though not the cover illustration (albeit, to be fair, the story is not so very much Newsstand Illustration-friendly for the times). 

Weird Tales [Vol. 36 No. 12, July 1943] ed. D. [Dorothy] McIlwraith (Weird Tales, Inc., 15¢, 112pp+, pulp, cover by E. Franklin Wittmack) [] 4 · The Shape of Thrills to Come · [uncredited] · ms; illustrated by Hannes Bok 6 · His Last Appearance · H. Bedford-Jones · ss; illustrated by Boris Dolgov 20 · The Street of Faces · Frank Owen · ss; illustrated by A. R. Tilburne 28 · The Unfriendly World · Allison V. Harding · nv; illustrated by Boris Dolgov 43 · Lost · Alice-Mary Schnirring · ss; illustrated by Fred Humiston 46 · The Scythe · Ray Bradbury · ss; illustrated by Fred Humiston 55 · Strange Music · Dorothy Quick · pm 56 · Return of the Undead · Otis Adelbert Kline & Frank Belknap Long · nv; illustrated by A. R. Tilburne 71 · Desert Dweller · Clark Ashton Smith · pm; illustrated by Hannes Bok 72 · Superstitions and Taboos · Irwin J. Weill · ia 74 · Legacy in Crystal · James Causey · ss; illustrated by John Giunta 83 · Yours Truly—Jack the Ripper · Robert Bloch · ss; illustrated by Boris Dolgov 96 · Tamara, the Georgian Queen · Harold Lawlor · ss 107 · The Eyrie · The Editor · ed _107 · [letter] · Harold Lawlor · lt _109 · [letter from Phoenix, AZ] · Richard Tooker · lt 110 · Weird Tales Club · [uncredited] · ms _110 · [letter from Tip Top, VA] · V. Edward Sutherland · lt _111 · [letter from Milwaukee, WI] · Lawrence Straw · lt _111 · New Members · [uncredited] · ms; lists 25 new members. This issue can be read here ...and here. ISFDB index link, here.

Unknown Worlds [v7 #1, June 1943] (25¢, 164pp, trimmed pulp) [] edited by John W. Campbell, Jr 
• · [illustrations] · Newton Alfred · il
• · [illustrations] · Ralph Hall · il
• · [illustrations] · Isip · il
• · [illustrations] · William A. Kolliker · il
• · [illustrations] · Frank Kramer · il
• · [illustrations] · Paul Orban · il
• 6 · Of Things Beyond · John W. Campbell, Jr. · ed
• 9 · Wheesht! · Cleve Cartmill · nv; illustrated by Paul Orban
• 35 · The Wishes We Make · E. Mayne Hull · ss; illustrated by Ralph Hall
• 48 · Blind Alley · Malcolm Jameson · nv; illustrated by Frank Kramer
• 71 · A Bargain in Bodies · Moses Schere · ss; illustrated by Isip
• 81 · Sriberdegibit · Anthony Boucher · nv; illustrated by Ralph Hall
• 102 · The Rabbit and the Rat · Robert Arthur · ss; illustrated by Paul Orban
• 115 · The Devil Is Not Mocked · Manly Wade Wellman · ss; illustrated by Newton Alfred
• 120 · Eight Ball · Hugh Raymond · ss; illustrated by William A. Kolliker
• 126 · The Green-Eyed Monster · Theodore Sturgeon · ss; illustrated by Frank Kramer
• 138 · The Hounds of Kalimar · P. Schuyler Miller · nv; illustrated by Isip
• 156 · Prophets and Critics · Anthony Boucher · ar

The most famous story here, I'd say, is the Wellman. I've certainly seen it collected and anthologized the most. Though the Sturgeon is probably a not too distant second...

• This issue can be read here.  ISFDB link here.

Fantastic Adventures [v5 #7, July 1943] (25¢, 212pp, pulp, cover by Robert Gibson Jones) [] 
Editors:
• B. G. Davis - Editor: Fantastic Adventures, May 1939 – Jan 1947.
• Raymond A. Palmer - Managing Editor: Fantastic Adventures, May 1939 – Jan 1947. (Palmer was the actual editor of the magazine at this time. TM)
• Howard Browne - Assistant Editor: Fantastic Adventures, Dec 1942 – Jul 1945 (And Browne succeeded Palmer as editor when Palmer left to start his own publishing company. TM)
• 
  
• 10 · Craig’s Book · Don Wilcox · na
• 88 · Vignettes of Famous Scientists: Bessel · Alexander Blade · bg
• 89 · Vignettes of Famous Scientists: Aristarchus · Alexander Blade · bg
• 90 · Little Yowlie · Warren A. Reed · ss
• 94 · If You Believe · Chester S. Geier · ss
• 108 · Caverns of Time · Carlos M. McCune · na
• 160 · The Goon from Rangoon [Lefty Feep] · Robert Bloch · ss
• 174 · What Are Hormones? · [uncredited] · ar
• 176 · Nazi, Are You Resting Well? · Leroy Yerxa · ss
• 182 · Other Worlds · Walton Blodgett · nv
• 200 · Introducing the Author: Carlos M. McCune · Carlos M. McCune · bg
• 208 · Warriors of Other Worlds: [Venus] · Morris J. Steele · ar

This issue can be read here.  ISFDB index here. (Bloch's light-hearted, pun-laden "Lefty Feep"-series story might well be the best-remembered story in this issue.)

Famous Fantastic Mysteries [Vol. V No. 4, September 1943] (25¢, 148pp, pulp, cover by Virgil Finlay) [] 
Editor: Mary Gnaedinger
• 8 · The Iron Star · John Taine · n. Dutton, 1930
• 116 · Doorway Into Time · C. L. Moore · ss
• 128 · Dwellers in the Mirage · Nanek · pm [Ref. A. Merritt]
• 130 · The Yellow Sign · Robert W. Chambers · nv The King in Yellow by Robert W. Chambers, F. Tennyson Neely, 1895
• · [letter from West Virginia] · Eugene W. Allbright · lt
• · [letter from Hertfordshire, England] · Frank Edward Arnold · lt
• · [letter from Illinois] · Ronald Clyne · lt
• · [letter from Minnesota] · Raymond Grumbo · lt
• · [letter from California] · Harry Honig · lt
• · [letter] · Mrs. Edward Honkanen · lt
• · [letter from South Dakota] · G. H. Laird · lt
• · [letter] · Nanek · lt
• · [letter] · John A. Savage · lt
• · [letter from Rhode Island] · Loren Sinn · lt

This issue can be read here. ISFDB index here. The Catherine L. Moore story would be the best remembered of the new fiction in this issue...even if by default. Chambers has had a spike in interest in part from television taking elements from his fiction and/or name-checking it in such series as True Detective, From, and Good Omens, the last in its turn based on the novel by Terry Pratchett and Alan Moore which also pays homage to Chambers, and apparently also Chilling Adventures of Sabrina, which I have yet to see.

Science Fiction [v3 #5, July 1943] (20¢, 116pp, pulp, cover by Milton Luros)  Robert (A.) W. Lowndes - Editor: Future Fantasy and Science Fiction, Oct 1942 –Feb 1943/Science Fiction (Stories), Apr 1943 –May 1960. 10 · Dominion · Arthur J. Burks · na 43 · Infiltration · Clifford D. Simak · ss 54 · Close to Home · Robert W. Lowndes · ed 55 · Blackout · Damon Knight · vi 58 · Problem in Ethics · Henry Kuttner · ss 69 · The Man Who Saved New York · Ray Cummings · ss 79 · The Stellar Vampires · Frank Belknap Long · ss 88 · The Machine That Changed History · Robert Bloch · ss 97 · The Answer Out of Space · Graph Waldeyer · ss This issue can be read here. ISFDB index here. The Bloch story is (just barely) the most widely-reprinted here. More to come in this post. Please see Patti Abbott's blog for more Short Story Wednesday links.