Dear Ross, 
 
I know that Dr. H. Hagemann of the Univ. of Hohenheim in Stuttgart Germany  
is in the middle of a major work on why emigrated and what happened  
thereafter.  I read a short article on one form historian of economic  
thought that I studied with in collge-- Josef Soudek (Czech).  Hagemann's  
work is first rate. 
I hope this is helpful.  How far from publication?  I have no idea. 
 
L. Moss