Exterior The Hilton Crystal City Hotel at Ronald Reagan Washington National Airport is located within walking distance to the metro, shopping, restaurants, and businesses, and within minutes of downtown Washington D.C.
A bookcase, or bookshelf, is a piece of furniture, almost always with horizontal shelves, used to store books. Bookcases are used in private homes, public and university libraries, offices and bookstores.
A textbook is  a book used for the study of a subject. People use a textbook to learn facts and methods about a certain subject. Textbooks sometimes have questions to test the knowledge and understanding of the learner. A workbook is a type of textbook that has only practice questions and exercises. Workbooks are designed not to teach but to provide practice and to highlight areas which need more learning.