Why Do You Suppose Bing, but not Google Can Hack this Search?

When you search for Eugen Doctor's 1908 pamphlet, “Emigration and Immigration—A Word on the Plight of Jewish Emigres," Google serves up junk, while Bing can actually point you to the work - ironically, some of the copies being on Google's servers. Why do you suppose this is?

Why? Just finishing up Goetz Aly's "Europe Against the Jews," which had been on my list for a while - and he mentions this one.