Gregorovius, Ferdinand 1821-1891.
The tombs of the popes: landmarks in papal history /
Ferdinand Gregorovius ; translated from the second and enlarged German edition, with a memoir of the author, by R.W. Seton-Watson 
. - Westminster : Archibald Constable & Co Ltd,  1903 
. - xli, 174 p.  ill.  20 cm.