Most public libraries in the US and UK subscribe to or OverDrive/Libby .
For historic Golden Age DC content (pre-1959), these sites offer thousands of free, legal PDF and digital downloads: Digital Comic Museum dc comics pdf 500 pages google drive
Free Google Drive accounts offer 15 GB of shared storage. If you plan on saving multiple 500-page omnibus PDFs to your own Drive account, monitor your storage capacity closely, as just a dozen of these massive files can easily max out your limit. Safe and Ethical Digital Comic Reading Most public libraries in the US and UK
: Extensive spreadsheets and research documents exist on Google Drive detailing eras from the Golden Age to modern continuity. DC Villains Catalog Safe and Ethical Digital Comic Reading : Extensive
Be cautious of .zip or .rar files that require a password from an unknown website. These are often used to bypass antivirus detection.
A great way to get a large volume of Diana's stories.