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Street & Smith's Unknown/Unknown Worlds

Although commonly referred to as Unknown, the magazine was actually called Street & Smith's Unknown for the first 26 issues and Unknown Worlds for the remaining 13 issues. A one-off anthology, From Unknown Worlds was published in 1948 in both a large pulp format and a hardback edition.

1939    
v1 #1
Mar

v1 #2
Apr

v1 #3
May

v1 #4
Jun

v1 #5
Jul

v1 #6
Aug

v2 #1
Sep

v2 #2
Oct

v2 #3
Nov

v2 #4
Dec
1940
v2 #5
Jan

v2 #6
Feb

v3 #1
Mar

v3 #2
Apr

v3 #3
May

v3 #4
Jun

v3 #5
Jul

v3 #6
Aug

v4 #1
Sep

v4 #2
Oct

v4 #3
Nov

v4 #4
Dec
1941  
v4 #5
Feb
 
v4 #6
Apr
 
v5 #1
Jun
 
v5 #2
Aug
 
v5 #3
Oct
 
v5 #4
Dec
1942  
v5 #5
Feb
 
v5 #6
Apr
 
v6 #1
Jun
 
v6 #2
Aug
 
v6 #3
Oct
 
v6 #4
Dec
1943  
v6 #5
Feb
 
v6 #6
Apr
 
v7 #1
Jun
 
v7 #2
Aug
 
v7 #3
Oct
   

From Unknown Worlds

1948

Street & Smith's Unknown/Unknown Worlds (UK)

1939                
v2 #1
Sep

v2 #2
Oct

v2 #3
Nov

v2 #4
Dec
1940
v2 #5
Jan

v2 #6
Feb

v3 #1
Mar

v3 #2
Apr

v3 #3
May

v3 #4
Jun

v3 #5
Jul

v3 #6
Aug

v4 #1
Sep

v4 #2
Oct

v4 #3
Nov

v4 #4
Dec
1941  
v4 #5
Feb
       
v4 #6
Jul
         
1942    
v5 #5
Mar
   
v6 #1
Jun
     
v6 #3
Oct
   
1943  
v6 #4
Feb
   
v6 #5
May
       
Oct
   
1944
Jan
     
May
 
Autumn
 
1945
Spring
 
Autumn

Winter
1946  
Summer
 
Winter
1947
Spring

Summer
 
Winter
1948
Spring

Summer
 
Winter
1949
Spring

Summer
 
Winter

From Unknown Worlds (UK)

This was published in both softback and hardback versions.

1948

Unknown Worlds (Australia and New Zealand)

A local distribution of the British Reprint Edition with a different cover price, but probably no other differences. Other issues may exist.

1942    
Mar
                 
1943        
May
       
Oct
   
1944
Jan
     
May
 
Autumn
 
1945    
Autumn
 
1946      
Winter
1947 Spring
Summer
 
Winter
1948 Spring
Summer
 
Winter
1949 Spring
Summer
 
Winter