ACM Digital Library: > 1M entries !!
Just this month the ACM Digital Library exceeded one million entries. They have full-text for all of their publications going back 60 years (!! and add 50k items per year) & claim the space of being the definitive computing industry resource. I use their DL several times a week and have been a member for several years now...

It's kind of ironic that their one millionth article is titled "Spam and the Ongoing Battle for the Inbox"..

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