网站简介：Links to on-line Smithsonian resources and answers to frequently asked questions from A to Z.
网站简介：Summit logs, photos, and web cams for mountains around the world. Guidebook listing organized by geographic region.
网站简介：Provides definitions of many of the terms used in studying the paranormal .Alphabetical index or by category.
网站简介：HyperHistory Online navigates through 3,000 years of world history with timelines of civilizations (plus maps), people, and events.
网站简介：Explanation of various terms and concepts that occur in spiritual literature.
网站简介：Provides 25,000 terms, 3,000 images, 40,000 cross-references. Windows app by annual subscription with free 30-day trial. Also offers iOS and Android apps.
网站简介：Entries include historical and modern plant usage, practices, influence and unusual properties, with multiple language common/botanical names and their meanings.
网站简介：Index of more than 800 varieties of herbs and plants, word search of the text, recipes, and an index of poisonous plants.
网站简介：Photos of succulents of numerous families.
网站简介：Statistical information on world religions, Christian denominations, and people groups. Based on the 2600-page World Christian Encyclopedia and World Christian Trends. A full-time staff at The Center for the Study of Global Christianity updates and maintains the database. Limited access is free; paid access gets full set of features.
网站简介：A resource center for the study of the international Trotskyist movement.
网站简介：An interactive Bible and Encyclopedia Suite, from Tyndale House Publishers. Features computer animation and virtual-reality tours.
网站简介：The Satellite Encyclopedia contains fact sheets with basic information such as launch date, country of origin, official identification, and payload description (EIRP maps). Extended launch vehicle section. Future satellites descriptions. Over 4000 pages and 9000 keywords.
网站简介：Articles about the people and ideas motivating the 1848 European revolutions. Most articles have bibliographies.
网站简介：Thorough coverage of present and past theater news and productions.
网站简介：Links to the contents of the Catholic Encyclopedia, Easton's Bible Dictionary, Torrey's Topical Textbook, Elwell's Dictionary of Christian Theology, and other sources.
网站简介：Read and contribute on the both natural and unnatural occurrences or the number three.
网站简介：Encyclopedia of sailing ships online: data, photos, history, contact addresses and other information about traditionally rigged sailing ships.
网站简介：Compiled by Richard R. Wright, Jr. Reference work published in 1916.
网站简介：An encyclopedia of the African Methodist Episcopal Church, published in 1882.
网站简介：Electronic version of the one volume print resource from Concordia Publishing House of The Lutheran Church-Missouri Synod. Includes history, theology, and biographies from within Lutheranism, general Christianity, and non-Christian beliefs.
网站简介：Encyclopedia of the plants of the region. For each family, genus and species there are photographs, distribution maps, descriptions, ecological information and references.
网站简介：Approximately 14,000 entries on topics including art, geography, literature, philosophy, religion. Originally published in 1907.
网站简介："A subset of the content (concise set) is provided for free, the access to the rest of the Hutchinson Encyclopedia requires subscription."
网站简介：Natural Remedies for over 500 diseases, such as cancer, heart disease, sexually transmitted diseases, childhood diseases, with a special section on preventive health.