Comment by queeerkopf

They seem to have made available almost their complete catalog up to and including 2004: http://link.springer.com/search?showAll=false&facet-content-...

This search yields 110 041 results across all disciplines covered by springer that should be free to download in complete. Only 11 451 books from the same time range are 'preview-only'.

I'm not certain that this is intentional. I haven't found any statement by Springer that they make available all ebooks older than 10 years. Does anyone know more?