西夏文字
Grinstead's major publication was his "Analysis of the Tangut script" (1972) in which he analysed the structure of the Tangut script, and assigned a four-digit 'Telecode' number to each Tangut character in an early attempt to assign standard codes to characters for use in computer processing of Tangut text. The book also includes an English–Tangut vocabulary list, and a study of the Tangut translation of the "Classic of Filial Piety" (Xiao Jing) in which Grinstead transcribed the very hard to read cursive Tangut characters of the text into their standard forms, which was considered an important achievement by other Tangut scholars. However, the book has been criticized as being difficult to read, having a 'haphazard' structure and an 'allusive' written style.