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In the book "Giordano BRUNO His Life and Thought" by Dorothea Waley Singer, chapter 7 references often have a form of 

18 Doc. Ven. XV.

or

49 Docc. Rom. XX, XXI.

How do I decipher their meaning?

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3  
This isn't a History question at all. I'd suggest trying English.se. – T.E.D.♦ Oct 21 '12 at 0:17
1  
Working with historical sources is not a history? Oh my God, where this world goes??? – Suzan Cioc Oct 21 '12 at 8:38

closed as off topic by T.E.D.♦, Russell, Steven Drennon♦ Oct 21 '12 at 2:49

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