Teen & Young Adult(青少年读物) (22) Nursing(护理学) (21) Philosophy(哲学) (21) Friendship, Social Skills & School Life(友谊,社交技巧与校园生活) (20) Industries & Professions(产业与行业) (20) Psychology(医学心理学) (19) Science Fiction & Fantasy(科幻玄幻) (18) Difficult Discussions(成长困境) (18) Biographies(传记励志) (18) Growing Up & Facts of Life(成长与常识) (18) Words, Language & Grammar(词语,语言与语法) (18) Surgery (17) Business & Money(商业与财富) (17) Internal Medicine (16) Geography & Cultures(地理与文化) (16) Social Sciences(社会科学) (16) 数理化生 (15) Physics(物理学) (15) History(儿童历史知识) (15) Romance(浪漫小说) (15) Early Learning(早教) (15) Mental Health(心理健康) (15) Fantasy (15) Allied Health Professions(综合职业健康) (14) 英语学习与阅读 (14) 武术及民族形式体育 (14) Psychology & Counseling(心理问题与咨询) (14) Europe(欧洲) (14) Education & Reference(教育与参考书) (14) Graphic Design(平面设计) (13) Thrillers(惊悚) (13) Literature & Fiction(文学小说) (12) Internet & Web Culture(互联网及网络文化) (12) Asia(亚洲) (12) 水上运动 (11) 法律教材与法律考试 (11) Specific Topics (11) History & Criticism(历史与批判) (11) Education Theory (11) United States(美国文学) (11) Reference(参考书) (11) Studying & Workbooks(学习方法与练习册) (11) Pharmacology(药理学) (10) Short Stories(超短篇小说) (10) United States (10) Arts & Photography(艺术与摄影) (10) Diets & Weight Loss(饮食控制与减重) (10) Business & Management(商业与管理) (10) Entertainment(休闲娱乐) (10) 各国民族形式体育 (9) Marketing & Sales(市场与销售) (9) 人文社科 (9) Sociology(社会学) (9) Drinks & Beverages(饮品与饮料) (9) Health(健康) (9) Military(军事) (9) Law(法律) (9) Diseases & Physical Ailments(疾病与身体失调) (9) Games(游戏) (9) Musical Genres (9) Mystery(推理) (8) New Age(新世纪) (8) Religions(宗教) (8) Relationships(关系) (8) 雪上运动 (7) Ethnic & National(种族与民族) (7) Religion & Spirituality(宗教与精神生活) (7) Horror (7) Professionals & Academics(专业人士与学者) (7) Exercise & Fitness(锻炼与健身) (7) Mathematics(数学) (7) Architecture(建筑) (7) Photography(摄影艺术) (7) Humor(幽默) (7) Movies(电影) (7) Home Design(家居设计) (7) Sports(运动) (7) Environmental (7) Civil & Environmental (7) Activities, Crafts & Games(游戏手工活动) (7) Job Hunting & Careers(求职与职业) (6) 现当代小说 (6) Health, Fitness & Dieting(健康,塑身与饮食控制) (6) European (6) Cancer (6) Other Media(其他媒体) (6) Science Fiction & Fantasy(科学幻想) (6) Pure Mathematics (6) Science(科学) (6) Biographies & Memoirs(传记与自传) (6) Decorative Arts & Design(设计与装饰艺术) (6) Equipment, Techniques & Reference (6) Songbooks (6) Outdoors & Nature(户外与自然) (6) Ancient & Classical Literature(古代与古典文学) (6) Engineering(工程业) (6) Reference (6) Beadwork, Fashion & Jewelry (6) True Crime(真实犯罪) (6) Arts & Literature(艺术与文学) (6) Race Relations (6) Home & Garden(家居与园艺) (5) Movements (5) Radiology (5) Mystery & Thrillers(推理与惊悚) (5) Small Business & Entrepreneurship(小型企业与创业精神) (5) How-to & Home Improvements(自助与家居改善) (5) Agricultural Sciences(农业科学) (5) Cooking, Food & Wine(烹调,食品与酒类) (5) Occult(神秘) (5) Digital Media Management(数字媒体管理) (5) Travel(旅游) (5) Family Relationships(家庭关系) (5) College & University(大学教育) (5) Alternative Medicine(可替代性药品) (5) Biological Sciences(生物学) (5) Chemistry(化学) (5) Technology(科学技术) (5) Women's Studies(妇女问题研究) (5) Arts, Music & Photography(艺术、音乐与摄影) (5) Marketing (5) Skills(商业技能) (5) Movements & Periods (5) Women's Fiction(女性小说) (5) Energy Production & Extraction (5) Sports & Outdoors(运动户外) (5) Computers(计算机) (5) Specific Demographics (5) Medicine(医药学) (4) 游戏 (4) Specific Groups (4) Essays & Correspondence(散文与信函) (4) British(英国文学) (4) Comics & Graphic Novels(动漫与绘画小说) (4) Christianity(基督教) (4) Databases(数据库) (4) Languages & Tools (4) Windows OS (4) Games & Strategy Guides(游戏与战略指南) (4) Microprocessors & System Design (4) Networks, Protocols & APIs (4) Networking(网络) (4) Parenting(子女养育) (4) Dictionaries & Thesauruses(字典与辞典) (4) Writing (4) Encyclopedias(百科全书) (4) Addiction & Recovery(成瘾性与戒断方式) (4) Earth Sciences(地球科学) (4) Astronomy(天文学) (4) Ancient Civilizations(古代文明) (4) Middle East(中东) (4) Television(电视) (4) Professional (4) Higher & Continuing Education(高等教育与继续教育) (4) Instruction Methods (4) Interior Design(室内设计) (4) Real Estate(房地产) (4) Business Life(商务生涯) (4) Materials & Material Science (4) Historical(历史人物) (4) Leaders & Notable People(领袖与名人) (4) 世界名著 (3) Basic Sciences(基础医学) (3) Dentistry(牙医学) (3) Veterinary Medicine(兽医) (3) Pathology (3) United States(美国) (3) History(历史) (3) Schools & Teaching(教学参考书) (3) 办公软件 (3) Baking(烘焙) (3) Individual Sports(单项运动) (3) 电影 (3) Religion & Philosophy(宗教与哲学思想) (3) Commercial (3) Science Fiction & Fantasy(科幻小说) (3) Software(软件) (3) Artificial Intelligence (3) Hardware(硬件) (3) Repair & Maintenance (3) Parenting & Families(养育与家庭) (3) Science Fiction (3) Biology (3) Great Britain (3) Applied (3) South America (3) Americas(美洲) (3) Canada (3) Theater (3) Hiking & Camping(远足与露营) (3) Outdoor Recreation(户外消遣) (3) Antiques & Collectibles(古董与收藏) (3) Test Preparation(备考指南) (3) Books & Reading (3) Ships (3) Electronics (3) Electrical & Electronics (3) Chemical (3) Telecommunications & Sensors (3) Fossil Fuels (3)