Adventures of the 4th Doctor is a 105-book series with 105 primary works first released in 1975 with contributions by Terrance Dicks, Ian Marter, Jacqueline Rayner, Stephen Marley, William H. Keith Jr., Tom Baker, James Goss, John Peel, Philip Hinchcliffe, Victor Pemberton, Justin Richards, Terry Nation, Bernard Venables, Keith Topping, Peter Darvill-Evans, Chris Boucher, Nicholas Briggs, Jim Mortimore, Alan Barnes, Marc Platt, Simon A. Forward, John Dorney, Jonathan Morris, Nigel Fairs, Philip Reeve, Andrew Smith, David Llewellyn, Paul Magrs, David A. McIntee, Dave Stone, David Fisher, Gareth Roberts, Lalla Ward, John Leeson, John Challis, Ray Brooks, Miranda Raison, Hugh Fraser, Mark Wright, Cavan Scott, Phil Mulryne, and Christopher H. Bidmead.