"Leboff, David and Tim Demuth; No Need to Ask! Early Maps of London's Underground Railways, Middlesex: Capital Transport Publishing, 1999. London firm of lithographic printing and publishing"@en . . "David Allen & Sons, Ltd."@en . . "2015-06-18"^^ . "2015-07-16"^^ . "2015-08-25"^^ . "2015-06-18"^^ . "2015-07-16"^^ . "2015-08-25"^^ . "active early 20th century"@en . . .