Checklists

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.

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

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

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