The Prajñā-pāramitā-ratna-guna-samcaya-gāthā (abbr. Rgs), 'Verses summarising the Precious Qualities of the Perfection of Wisdom', is a notable example of Buddhist Sanskrit literature at its earliest stage. It is probably the only extant text in Prajñāpāramitā literature written in the typical Buddhist Sanskrit language, it displays a number of unique grammatical forms and constructions, and is one of the earliest documents of Prajñāpāramitā thought. Dr Yuyama's aim was to present an edition of Sanskrit Recension A, represented by a single manuscript kept in the Asiatic society of Calcutta, which appeared to preserve more original readings than the other recensions in Sanskrit, Tibetan and Chinese. Detailed footnotes explain how the readings were adopted in this version. There is included an edition of the Tibetan Version from Tunhuang, and it is argues that this version offers better readings of many verses. The many complex problems of the Rgs literature are discussed at length.