There is some disagreement among scholars as to which poems included in the surviving Man'yōshū originally came from the Hitomaro Kashū, but it is between 364 and 370.
Scholars have speculated on the nature of the original Hitomaro Kashū based on the surviving fragmentary and disjointed evidence.
[1] While the text itself does not survive,[2] scholars have been able to guess as to the form the work probably took based on the portions of the late eighth-century Man'yōshū that incorporate a large number of its poems.
[2] Mizue Aso [ja], in her article on the work for the Nihon Koten Bungaku Daijiten, gave the figure of 365.
[4] The tanka attributed by the compiler(s) of the Man'yōshū to the Hitomaro Kashū are divided into two categories based on how distinctly particles and auxiliary words are represented therein.