Ashley, Mike (2007). Gateways to Forever: The Story of the Science-Fiction Magazines from 1970 to 1980. Liverpool: Liverpool University Press. ISBN978-1-84631-003-4. Page 480.
Ashley, Mike (2016). Science Fiction Rebels: The Story of the Science-Fiction Magazines from 1981 to 1990. Liverpool: Liverpool University Press. ISBN978-1-78138-260-8. Page 441.
Raw data:
Year
Newsstands & dealers
Subscriptions
1962/63
37,286
14,790
1963/64
36,289
16,999
1964/65
37,197
16,634
1965/66
34,515
16,619
1966/67
32,922
18,680
1967/68
32,798
17,738
1968/69
31,135
19,164
1969/70
31,388
18,913
1970/71
27,896
18,289
1971/72
25,570
16,624
1972/73
24,268
19,695
1973/74
26,020
26,335
1974/75
25,159
30,749
1975/76
23,228
28,504
1976/77
21,845
35,641
1977/78
23,218
34,682
1978/79
20,955
36,773
1979/80
21,787
40,284
1980/81
19,094
41,139
1981/82
16,852
44,876
1982/83
14,525
49,743
1983/84
13,800
44,183
1984/85
14,159
40,090
1985/86
13,779
42,691
1986/87
13,011
39,879
1987/88
12,463
47,169
1988/89
12,374
41,897
1989/90
12,515
40,069
1990/91
12,329
56,550
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