The Showa Teihon Nichiren Shonin Ibun (Writings of Nichiren Shonin standardised in the Showa period) compiled by the Rissho Daigaku Nichiren Kyogaku Kenkyu Jo (Center for the Study of Nichiren Buddhism) in four volumes and published by Kuonji Temple in 1952-1959 are considered the most authoritative collection of Nichiren Shonin's writings. Because of the difficulty of reading Nichiren Shonin's original writings, the Nichiren Shonin Zenshu (Complete Writings of Nichiren Shonin) were published in 1992 and 1996 to provide access for everyone in an easy-to-read modern Japanese form. In 2000, the Nichiren Overseas Propagation Promotion Association began the English translation of the 7-volume Nichiren Shonin Zenshu. Although this work is titled as the complete writings, it only contains the writings that are considered bibliographically authentic in light of modern scholarship. There are a few writings included in the 7 volumes that are of questionable authenticity; these are specifically indicated in their introductions. Volumes 1-5 are already available available.