Wolfgang Plath (1982) has deduced the existence of five scribes, from a study of the handwriting in the '. In addition to Leopold and Wolfgang, three anonymous scribes from Salzburg – known as Anonymous I, Anonymous II and Anonymous III – have been identified. Numbers 58 and 61, thought to be in the four missing pages, are known only from Nissen's material; Plath assumed that these two pieces were copied out by Leopold, who was responsible for more than half the contents of the '.