Underground areas -- England -- London -- History. / https://id.loc.gov/authorities/subjects/sh85139577 https://id.loc.gov/authorities/names/n79005665-781 https://id.loc.gov/authorities/subjects/sh99005024 : Pike, David L.
Underground areas -- France -- Paris -- History. / https://id.loc.gov/authorities/subjects/sh85139577 https://id.loc.gov/authorities/names/n79058874-781 https://id.loc.gov/authorities/subjects/sh99005024 : Pike, David L.