Publishers of this series (in chronological order): - Originally self-published as I-SPY Spotterbook, no. 1-5, by Charles Warrell under the aegis of Warrell Way Publishers, of Ruislip, Middlesex, - 1948-49. - Daily Mail. - News Chronicle/News Chronicle Book Department - 1950s. - The Dickens Press - 1963. - Ravette Publishing - 1983-84.