Pellucidar is a series of seven novels written by Edgar Rice Burroughs, written and taking place in the 1910s, 1920s and 1930s. In this verse, the Earth is hollow and there is another world on the inside, called Pellucidar, inhabited by dinosaurs and others monsters as well as primitive humans.The complete series is composed of the following novels:
At the Earth's Core. Published in serial form in April, 1914. Book form published in July, 1922.
Pellucidar. Published in serial form in May, 1915. Book form published in September, 1923.
Tanar of Pellucidar. Published in serial form from March to August, 1929. Book form published in May, 1930.
Tarzan at the Earth's Core. Published in serial form from September, 1929 to March, 1930. Book form published in November, 1930.
Back to the Stone Age. Published in serial form from January to February, 1937. Book form published in September, 1937.
Land of Terror. First published in 1944. Unusually the book was its original form.
Savage Pellucidar. Collects four Pellucidar short stories. Three from 1941 and 1942, and one previously unpublished story. The collection was first published in 1962.
Blue and Orange Morality: The Mahars aren't evil; they simply lack any concept of sound, and so they don't understand the other creatures they treat as slaves are intelligent beings in their own right.
Canon Welding: The fourth book, Tarzan at the Earth's Core, quite clearly defines the Tarzan and Pellucidar novels as part of the same continuity, with the usual heroes teaming up with Tarzan and his allies for a Crossover.
Cluster F-Bomb: Thanks to the time period Burroughs couldn't actually write it, but he still manages to make very clear that Perry's reaction to his drill refusing to turn at the start of the adventure would make a sailor blush.
Direct Line to the Author: In the first novel, Burroughs claims to have had the story of David Innes' adventure in Pellucidar direct from Innes, having met him during a safari in the Sahara desert some time afterward. Each of the sequels mentions that they've stayed in touch and Innes has been keeping him informed of subsequent events.
Dacor the Strong One, Ghak the Hairy One, Hooja the Sly One, Jubal the Ugly One... etc.
Mighty Whitey: The people from the surface who come to Pellucidar. Something of a variant, as there are other white people in Pellucidar; the surface dwellers are (generally) mighty because of their more technologically advanced culture.
Except for Tarzan. The Jungle Lord needs no technology to show the cavemen who's boss.
Nubile Savage: Dian the Beautiful. All of her people, too, the Tribe of Amoz. Also their neighbors, the people of Sari.
Traveling at the Speed of Plot: Some of the stories played with the notion of time as highly variable in a situation where there's no day-night sequence to measure it by. David Innes was once accidentally separated from his comrade and went through several weeks worth of adventures. When they were reunited, he discovered that since his friend hadn't needed to exert himself to anywhere near the extent David did, for him less than an hour had passed.