31 May

More online sources of free full texts:

Bartleby

Classic Reader

Corpus Sciptorum Latinorum

Internet Classics Archive 

LacusCurtis: Into the Roman World

Literature Network

Online Medieval and Classical Library

Perseus Digital Library

Project Libellus 

(in Latin only): Latin Library

Luminarium: Anthology of English Literature provides links to full-text scans and secondary literature about the writers.

and, at Infomotions, the Alex Catalogue of Electronic Texts

Infomotions features a Great Books Survey specifically concerning the Adler/ Hutchins Greats Books of the Western World set (and more specific still, the original 1952 version of that set, not the larger 1990 second edition).