No science fiction library would be complete without Astounding Stories of Super-Science, a highly influential pulp magazine of both sci-fi and horror from the early 1930s!
Vol. 20 includes:
THE DANGER FROM THE DEEP, RALPH MILNE FARLEY
Marooned on the Sea-Floor, His Hoisting Cable Cut, Young Abbot Is Left at the Mercy of the Man-Sharks.  
 
BROOD OF THE DARK MOON, CHARLES WILLARD DIFFIN
Once More Chet, Walt and Diane Are United in a Wild Ride to the Dark Moon. But This Time They Go as Prisoners of Their Deadly Enemy Schwartzmann. (Beginning a Four-Part Novel.)    
IF THE SUN DIED, R. F. STARZL
Tens of Millenniums After the Death of the Sun There Comes a Young Man Who Dares to Open the Frozen Gate of Subterranea.  
 
THE MIDGET FROM THE ISLAND, H. G. WINTER
Garth Howard, Prey to Half the Animals of the Forest, Fights Valiantly to Regain His Lost Five Feet of Size. A Complete Novelette.)    
THE MOON WEED, HARL VINCENT
Unwittingly the Traitor of the Earth, Van Pits Himself Against the Inexorably Tightening Web of Plant-Beasts He Has Released from the Moon.    
THE PORT OF MISSING PLANES, CAPTAIN S. P. MEEK
In the Underground Caverns of the Selom, Dr. Bird Once Again Locks Wills with the Subversive Genius, Saranoff.    
THE READERS CORNER, ALL OF US
A Meeting Place for Readers of Astounding Stories