Public Domain eBooks at Minute Man

I have a library card for the Minute Man network (serving mostly "Metrowest" Boston area) and they have a store of downloadable eBooks that are in the public domain. I decided to educate myself on the collection by searching the--what else?--poetry selection:

Ballads of Robin Hood and Other Outlaws:

Five Edna St Vincent Millay books (search "Millay")

And lots of other titles.