Of note are the letters of Paul and Seneca, and the letters of Herod and Pilate, which are most likely a forgery, but add more depth to the question of the historicity of Jesus. There are also a number of non-canonical epistles, such as Laodiceans. Also worth a close read are the three books of the Shepherd of Hermas, which uses apocalyptic and symbolic imagery. This collection is an invaluable selection of portions of the New Testament which illustrates the fluid nature of the early Biblical canon, and provides access to all of the 'spare parts.' The Forgotten Books of Eden by Rutherford H. Platt, Jr., 1926 This is a popularized translation of the OT pseudepigrapha, quasi-Biblical writings which never achieved canonical status (or inclusion in any of the official Apocrypha). This isn't to say that these documents are forgeries, just that for one reason or another they were not considered part of the Biblical text by the first millenium (C.E.) compilers. This book contains translations of all of the texts found in volume I of the weighty Oxford University Press Apocrypha and Pseudepigrapha, without any of the apparatus. You can find here for free such popular books as: The Apostles' Creed, The Shepherd of Hermas, The First Book of Adam and Eve, The Gospel of Nicodemus and many others books which are missing of the Bible!