Based on the "Full Text", it looks like they used an automatic OCR to obtain the text from the PDFs, so they are full of many spelling and formatting mistakes. I prefer to get the B/W pdf and split it into files that are small enough not to lag on the Kindle hardware (I have the 2nd generation).
It was hard to find so thought I'd share. First go to the full-screen page, then click the "about this book" icon ("i" within a circle). There are links to the following:
PDF
Plain
Text
DAISY
ePub
Send to Kindle