^The term "science fiction" would not be coined until 1929, but there were other terms used: "scientific romance" and "scientific fiction", for example.
^A pulp magazine was usually 10 x 7 inches, but magazines are often regarded as pulps even if they printed most or all of their run in other sizes – 11.75 x 8 inches is known as large pulp, and sometimes as bedsheet, though this latter term is confusing because "bedsheet" format can also refer to a different, significantly larger, magazine format.
^The Thrill Book was initially released in dime-novel format, but switched to pulp with its ninth issue. The typical dime-novel format was saddle-stapled, and either 5 x 7 inches or 8.5 x 11 inches; The Thrill Book was 8 x 10.75 inches.
^The term "different" for this sort of story had been coined by Robert A. Davis, one of the editors at Munsey.
^Palmer claimed the highest circulation of any science-fiction magazine, but del Rey comments that though this may have been true, "Palmer's tendency to magnify everything about the magazine cannot be discounted."