Data from Books Ngram Viewer
aliens, hard sf (2)
fiction, hard sf (2)
hard sf, science fiction (2)
hard sf, sf (2)
hard sf, space opera (2)
hard, science (2)
novel, physics (2)
physics, sf (2)
physics, sf, -YA (2)
2011, hard sf (1)
aliens, hard sf, science fiction (1)
British fiction, gender (1)
fiction, physics (1)
fiction, progress (1)
fiction, science, steampunk (1)
fiction, space exploration (1)
hard sf, novel, space opera (1)
hard, sci-fi (1)
hard, science fiction (1)
