All topics are here, from AIDS to the Zoramites.
I think it's important to read the Preface:
According to a standard definition, an encyclopedia is to "treat comprehensively all the various branches of knowledge" pertaining to a particular subject. The subject of this Encyclopedia is The Church of Jesus Christ of Latter-day Saints, widely known as the Mormon church. This is the first major encyclopedia published about the Mormons. It presents the work of hundreds of Latter-day Saint (LDS) lay scholars and others from throughout the world and provides a comprehensive reporting of Mormon history, scripture, doctrines, life, and knowledge, intended for both the non-Mormon and the LDS reader. Readers will find an article on almost any topic conceivably related to the general topic of Mormonism, but no article is exhaustive because of space limitations. Most articles include bibliographic references; cross-references to other articles in the Encyclopedia are indicated by small capital letters.
When Macmillan Publishing Company asked authorities at Brigham Young University whether they would be interested in developing an encyclopedia about The Church of Jesus Christ of Latter-day Saints, President Jeffrey R. Holland took the query to his Board of Trustees. They instructed him to proceed. Working closely with Church authorities and Macmillan, President Holland chose an editor in chief and a board of editors. Discussion of possible titles concluded that the work should be called the Encyclopedia of Mormonism since that is the term by which the Church is most widely known, though unofficially.
The contract called for a work of one million words in about 1,500 articles in four volumes including pictures, maps, charts, appendices, indices, and a glossary. It soon became apparent that references to what the Church calls the standard works-the Bible, the Book of Mormon, the Doctrine and Covenants, and the Pearl of Great Price-would be so frequent that readers who did not have ready access to those works would be at a serious disadvantage in using the Encyclopedia. A fifth volume was decided upon to include all the LDS standard works except the Bible, which is readily available everywhere.
The Church does not have a paid clergy or a battery of theologians to write the articles. It functions with a lay ministry, and all members are encouraged to become scholars of the gospel. Over 730 men and women were asked to write articles on topics assigned because of previous interest and study.
Six major articles unfold the History of the Church: (1) the background and founding period in New York; (2) the Ohio, Missouri, and Illinois periods ending with the martyrdom of Joseph Smith; (3) the exodus west and the early pioneer period under Brigham Young; (4) the late pioneer Utah period ending at the turn of the century and statehood; (5) a transitional period during the early twentieth century; and (6) the post-World War II period of international growth. The History of the Church has been dramatic and moving, considering its brief span of just over 160 years. Compared to Catholicism, Judaism, ancient Far East religions, and many Protestant churches, the Church has a very short history.
Nearly 250 articles explain the doctrines of the Church, with special emphasis on basic principles and ordinances of the gospel of Jesus Christ. Twenty-four articles are clustered under the title "Jesus Christ," and another sixteen include his name in the title or relate directly to his divine mission and Atonement.
Over 150 articles relate the details on such topics as the First Vision, Zion's Camp, Handcart Companies, Plural Marriage, the Salt Lake Temple, Temple Square, and the Church throughout the world. Biographies cover men and women contemporary in the life of Joseph Smith, Presidents of the Church, and auxiliary founders and past presidents. The only biography of a person living at the time of publication is on the present prophet and President of the Church, Ezra Taft Benson.
And finally, there are over a hundred articles primarily concerned with how Latter-day Saints relate to their families, the Church, and to society in general. It is said there is a "Mormon culture," and several articles explore Mormon lifestyle, folklore, folk art, artists, literature, and other facets that distinguish Latter-day Saints.
It may be that the growth of the Church in the last decades has mandated the encyclopedic account that is presented here. Yet, even as the most recent programs were set down and the latest figures listed, there is an acute awareness that the basic tenet of the Church is that its canon is open-ended. The contemporary President of the Church is sustained as a "prophet, seer, and revelator." While this makes some theological discussion moot, the basic beliefs of the Latter-day Saints, summarized in the Articles of Faith (see Glossary) do not change.
In several areas, the Church shares beliefs held by other Christians, and a number of scholars from other faiths were asked to present articles. However, the most distinctive tenets of the Church-those regarding the premortal and postmortal life, living prophets who receive continuous and current revelation from God, sacred ordinances for deceased ancestors, moral and health codes that provide increasingly well-documented benefits, and the potential within man for progression into an infinite future-are all treated primarily by writers selected from among Latter-day Saints.
Lest the role of the Encyclopedia be given more weight than it deserves, the editors make it clear that those who have written and edited have only tried to explain their understanding of Church history, doctrines, and procedures; their statements and opinions remain their own. The Encyclopedia of Mormonism is a joint product of Brigham Young University and Macmillan Publishing Company, and its contents do not necessarily represent the official position of The Church of Jesus Christ of Latter-day Saints. In no sense does the Encyclopedia have the force and authority of scripture.