1
Published: Hamburg-Bergedorf, Hamburger Sternwarte, 1965
   
2
Published: London, Williams and Norgate Ltd., 1941
   
3
Published: Hamburg-Bergedorf, Hamburger Sternwarte, 1963
   
6
   
7
Published: Cambridge, Mass., The Medieval Academy of America, 1933
   
8
   
10
Published: Ithaca, NY, Cornell Univ. Press, 1959
   
11
Published: Ithaca, NY, Cornell Univ. Press, 1965
   
12
Medieval institutions : selected essays 1. print., Cornell paperbacks
Published: Ithaca, NY, Cornell Univ. Press, 1967
   
13
   

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