Michael Darby first published a comprehensive list of Thomas Stevens' bookmarks in 1968, in his book 'Stevengraphs', co-authored with Austin Sprake. Darby lists some 460 bookmarks manufactured by Stevens.
Geoffrey Godden extended Darby's work, and listed some 520 bookmark titles.
Stevens himself claimed 900 different designs, although this number probably included colour variations.
With the help of John High's unpublished work and other sources, this web site now lists in excess of 790 individual bookmark titles (and 1,240 designs if colour variations are included), all produced by Stevens in Coventry.