1939-1945 2005l-914 20thcentury [fic] action adventure adventureandadventurers adverseeffects animalburrowing animals antiquities brothers burrowinganimals businessmen casestudies cavedwellers children'sfiction citiesandtowns cityplanning civilization climaticchanges congresses contemporary crime cults descriptionandtravel detectiveandmysterystories dinosaurs dystopias ecosystems effectofhumanbeingson england environment evolution excavations(archaeology) family fantasy fantasyfiction ferrocarrilessubterráneos fiction footprints fossil friendship general geology globalwarming groundcontrol(mining) growth habitats hazardoussubstances history homelessgirls hommesd'affaires horror household humanecology ichnology identity identity(philosophicalconcept) identity(psychology) indianmythology individuality infrastructure(economics) juvenilefiction kikistrike(fictitiouscharacter) landscapes landuse lifesciences literary london london(england) londonbelow magic miningengineering monsters moving mythology métros nature negociantes newford(imaginaryplace) newyork newyork(state) newyorktimesbestseller nouvelles novela nucleararmscontrol nuclearnonproliferation nuclearwarfare nuclearweapons nyt:e-book-fiction=2012-03-04 paleontology personasdesamparadas prehistoriccreatures publicutilities radioactivefallout rats readinglevel-grade10 readinglevel-grade11 readinglevel-grade12 readinglevel-grade7 readinglevel-grade8 readinglevel-grade9 revolutions romans science sciencefiction sheriffs siblings sociallifeandcustoms soilanimals subterranean subways supernatural thenaturalworld tracefossils tunnels undergroundarchitecture undergroundconstruction undergroundhomelesspersons undergroundutilitylines unitedstates urbanlife utopias voyagesandtravels wn610e2652005 womenphotographers worldwar zonessouterraines áreassubterráneas