I present to you parts of two encyclopedias published by the Arab Organization for Education, Culture and Science. The first encyclopedia: (The Reference Book on the History of the Arab Nation) It is a comprehensive reference encyclopedia for the political, economic, social, and cultural history of the Arab nation. It meets the needs of the specialized scholar and the general reader alike, and contributes to introducing the nation's history to researchers from outside the Arab world. It was published in 7 huge volumes with luxurious printing. The second encyclopedia: (Encyclopedia of Arab and Muslim Scientists and Writers) It is a very large encyclopedia that documents the contributions of an elite group of Arab and Muslim scientists and writers throughout various eras, contributing to preserving Arab cultural memory and enhancing its presence in the research and academic space. So far, 33 volumes have been published, up to the letter 'Kaf'. - **** Available with me **** 4 volumes of (The Reference Book on the History of the Arab Nation): Volumes 3/1, 3/2, 3/3, and Volume 4. 6 volumes of (Encyclopedia of Arab and Muslim Scientists and Writers): Volumes 16 to 21. - All volumes are in excellent condition. For sale as a complete set.