Some, or all, of the issues were also distributed in the US, initially just with an overprinted price, but after April 1953 with specific US editions with the same volume/issue number but different cover dates.
1952
v1 #4
Dec
1953
v1 #5
Jan
v1 #6
Feb
v2 #1
Apr
v2 #2
May
v2 #3
Jun
v2 #4
Jul
v2 #5
Sep
v2 #6
Oct
v3 #1
Nov
v3 #2
Dec
1954
v3 #3
Jan
v3 #4
Feb
v3 #5
Mar
v3 #6
Apr
v4 #1
May
v4 #2
Jun
v4 #3
Jul
v4 #4
Aug