OpenStax
OpenStax offers free college textbooks for all types of students, making education accessible & affordable for everyone. Browse our list of available subjects!
提供一个收集世界各地的数以百万计的图书数字化图书馆。
数据统计
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Mags Guru
Read the latest magazines in PDF, thousands of mags issues, ebooks and newspapers. Get free full digital copies of your beloved magazines on a computer, tablet or smartphone.
宾夕法尼亚大学在线阅读
Digital.library server at Penn Libraries
Zvdd
ZVDD ist das Nachweisportal für in Deutschland erstellte Digitalisate von Druckwerken vom 15. Jahrhundert bis heute.
planetebook
100% Free eBooks for All Devices
ebook3000.
ebook3000.com is the best free ebooks download library. It's the open directory for free ebooks and download links, and the best place to read ebooks and search free download ebooks.
OLL
书籍格式有扫描输入的PDF版，...
Free eBooks
Free eBooks | Project Gutenberg
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