have appeared, such as The Green Bible, an English version of the New Revised Standard Version Bible (originally published by Harper Bibles on October 7, 2008), which focuses on environmental issues and teachings. Features A study Bible usually contains such features as: Annotations explaining difficult passages or points of theology and doctrine Articles and short biographies or character studies of Biblical people, places, and topics A concordance, a word index that indicates where various keywords are used in the Bible Contextual setting, including discussion of culture, customs, history, and timelines that relate Bible history to world history Harmonies of the Gospels, pointing out parallel incidents in the life of Jesus Illustrations of locations and artifacts Introductions and historical notes for each book of the Bible Life/practical application Maps and charts that illustrate the Holy Land during Biblical times and may show the same areas today References or cross-references, to indicate where one passage of the text relates to others Variant readings or interpretations of certain debatable passages, or possible conjectural emendations (i.e., alterations based on a philological expert's "educated guess" of the likely form of the original Hebrew or Greek, when the translators feel this is not sufficiently clear, possible translations from other ancient versions such as the Septuagint, Targumim, Peshitta, and Vulgate, readings from other manuscript families, such as marking those passages missing which are present in the Byzantine text-type in a modern textual eclectic translation, or marking those passages present which are missing in the Alexandrian text-type and the modern critical text in a translation from the Textus Receptus or Byzantine text-type, etc.) Word definitions to explain difficult or complex words and ideas Study Bible software Study Bible software is also available which can aid readers in the study of the Bible. This software normally includes several Bible translations, commentaries, Bible Dictionaries, maps and other content. They also include search engines to enable users to find Bible passages by keyword and by theme. References Further reading How to choose a study Bible, by John R. Kohlenberger III, Christian Research Institute, 1996 – analyzes several study Bibles available, with short descriptions, and recommendations from an evangelical Christian perspective. Bible versions and translations