Publishers are partnering with JSTOR to provide free online access to ebooks through June 30, 2020. As the access to print books is cut off for researchers, JSTOR and friends are making over 30,000 titles available to libraries - even those without an ebook subscription- free of charge.
See the list of publishers and a full title list at the bottom of this marketing page.
Also, browse titles in UK's instance of JSTOR today, or search for the titles in UK Libraries' Infokat Discovery starting March 27th.