titled 'Number 69: September 1967, A survey of the development of television test cards used in the BBC, by, G. Hersee, M.I.E.R.E.', blue grey papers Note: A historical review of the design of early test cards, followed with a discussion of the purposes of test cards, influence of reproduction problems on their design, the monograph describes design and manufacture of the, then, 'latest' Trade Test Card ‘F’, for use with a colour service, giving various examples of specialized test cards and their uses.