Docstoc.com: Docstoc was an electronic document repository and online store, aimed at providing professional, financial and legal documents for the business community. It closed in 2015.
Dokumen: https://dokumen.tips/
Free Library, The, by Farlex: Claims 32.5 million articles and books: https://www.thefreelibrary.com/
ISSUU: https://issuu.com/ ;
Radionics Experts about 30 monographs: https://www.rad111.com/radionics-libraries/
Scribd: https://www.scribd.com/home ; Scribd is a digital library and ebook, audio subscription service that includes one million titles. In addition, Scribd hosts 60 million documents on its open publishing platform.
Vdoc.pub Cassandre Schimmel: https://vdoc.pub
Yumpu: https://www.yumpu.com/en