Thirty-seven cards (37 sides)
'This is a pack of cards on which are printed ... the items of the Standard Test of Reading Skill, Test I in the book "Standard reading tests" by J.C. Daniels and Hunter Diack ... [London : Chatto and Windus, 1958]'.
The Standard Test of Reading Skill ... by John Clifford Daniels. ISBN 0247127159. Published by Hart-Davis in 1976. Publication and catalogue information, links to buy online and reader comments.