I have noticed that the quality of books by these two publishers has plunged. I have seen a couple of recent Springer titles with very poor glued bindings and very poor print quality. What Elsevier-Butterworth-Heinemann have done to the Landau and Lifshitz series is criminal. The Pergamon printings in the 70s and 80s (which include the most recent editions) were marvelous: high quality print on thick paper with robust sewn bindings. I compared a new Springer GTM to my old copy of Hungerford's "Algebra" and it was like night and day. The new one has a cheesy glued binding and I expect the pages will start falling out after the book has been opened less than a dozen times. The paper isn't even good enough to wrap a fish in. I picked up Zee's big book on general relativity and was pleasantly surprised to see the print and binding quality is as good as any book I've ever seen.