British reprint edition of (Worlds of) If.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1953 | v1 # 1 |
v1 # 2 |
|||||||||||
| 1954 | v1 # 3 |
v1 # 4 |
v1 # 5 |
v1 # 6 |
v1 # 7 |
v1 # 8 |
v1 # 9 |
v1 #10 |
v1 #11 |
v1 #12 |
v1 #13 |
v1 #14 |
|
| 1955 | #15 |
||||||||||||
| 1959 | #1 Sep |
||||||||||||
| 1960 | # 2 |
#3 Mar |
#4 May |
#5 Jul |
#6 Sep |
#7 Nov |
|||||||
| 1961 | #8 Jan |
#9 Mar |
#10 May |
#11 Jul |
#12 Sep |
#13 Nov |
|||||||
| 1962 | #14 Jan |
#15 Mar |
#16 May |
#17 Jul |
#18 Sep |
||||||||
| 1967 | v16 #3 #100 Jan |
v16 #4 #101 Feb |
v16 #5 #102 Mar |
v16 #6 #103 Apr |
v16 #7 #104 May |
v16 #8 #105 Jun |
v16 #9 #106 Jul |
v16 #10 #107 Aug |
v16 #11 #108 Sep |
v16 #12 #109 Oct |
|||
| 1969 | v19 #8 #141 Nov |
v19 #9 #142 Dec |
|||||||||||
| 1970 | v19 #10 #143 Jan |
v20 #1 #144 Feb |
v20 #2 #145 Mar |
v20 #3 #146 Apr |
v20 #4 #147 May |
v20 #5 #148 Jun/Jul |
v20 #6 #149 Aug/Sep |
||||||
Title changed from If.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1972 | v21 #5 May/Jun |
v21 #6 Jul/Aug |
v21 #7 Sep/Oct |
v21 #8 Nov/Dec |
|||||||||
| 1973 | v21 #9 Jan/Feb |
v21 #10 Mar/Apr |
v21 #11 May/Jun |
v21 #12 Jul/Aug |
v22 #1 Sep/Oct |
v22 #2 Nov/Dec |
|||||||
| 1974 | v22 #3 Jan/Feb |
v22 #4 Mar/Apr |
v22 #5 May/Jun |
v22 #6 Jul/Aug |
v22 #7 Sep/Oct |
||||||||
William Hamling has stated that he was the editor & publisher from the beginning. The first 2 issues were published while Hamling was still employed at Ziff-Davis so Ray Palmer acted as a front and those issues give Palmers company as the publisher. They do not, however, list an editor, allowing readers to assume that it was Palmer.
Publishers: Clark Publishing Co.; Evanston, IL, Oct 1950 Dec 1950; Greenleaf Publishing Co.; Evanston, IL, Feb 1951 Oct 1958.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | mid-Dec | |
| Winter | Spring | Summer | Fall | Winter | |||||||||
| 1950 | v1 #1 Oct |
v1 #2 Dec |
|||||||||||
| 1951 | v2 #1 #3 Feb |
v2 #2 #4 Apr |
v2 #3 #5 Jun |
v2 #4 #6 Sep |
v2 #5 #7 Nov |
||||||||
| 1952 | v3 #1 #8 Jan |
v3 #2 #9 Mar |
v3 #3 #10 May |
v3 #4 #11 Jul |
v3 #5 #12 Sep |
v3 #6 #13 Oct |
v3 #7 #14 Dec |
||||||
| 1953 | v4 #1 #15 Jan |
v4 #2 #16 Feb |
v4 #3 #17 Apr |
v4 #4 #18 May |
v4 #5 #19 Jun |
v4 #6 #20 Jul |
v4 #7 #21 Aug |
v4 #8 #22 Sep |
v4 #9 #23 Oct |
v4 #10 #24 Nov |
v4 #11 #25 Dec |
||
| 1954 | v5 #1 #26 Jan |
v5 #2 #27 Feb |
v5 #3 #28 Mar |
v5 #4 #29 Apr |
v5 #5 #30 May |
v5 #6 #31 Jun |
v5 #7 #32 Jul |
v5 #8 #33 Aug |
v5 #9 #34 Sep |
v5 #10 #35 Oct |
v5 #11 #36 Nov |
v5 #12 #37 Dec |
|
| 1955 | v6 #1 #38 Jan |
v6 #2 #39 Feb |
v6 #3 #40 Mar |
v6 #4 #41 Apr |
v6 #5 #42 May |
v6 #6 #43 Jun |
v6 #7 #44 Jul |
v6 #8 #45 Oct |
v6 #9 #46 Dec |
||||
| 1956 | v7 #1 #47 Feb |
v7 #2 #48 Apr |
v7 #3 #49 Jun |
v7 #4 #50 Aug |
v7 #5 #51 Oct |
v7 #6 #52 Dec |
|||||||
| 1957 | v8 #1 #53 Feb |
v8 #2 #54 Apr |
v8 #3 #55 Jun |
v8 #4 #56 Aug |
v8 #5 #57 Oct |
v8 #6 #58 Dec |
|||||||
| 1958 | v9 #1 #59 Feb |
v9 #2 #60 Apr |
v9 #3 #61 Jun |
v9 #4 #62 Aug |
v9 #5 #63 Oct |
||||||||