Venezia, BNMarciana = Biblioteca Nazionale Marciana, Venezia, Italy
Manuscripts at Venice, BNM, are listed with fourfold numbering:
(1) the shelfmark = language, thereafter either 'Z.' or a Roman numeral, and then arabic numerals,
(2) the present location in the library's storage = arabic numerals,
(3) description in the catalogue by Valentinelli = volume and page,
(4) Valentinelli's internal numbering of manuscripts = Roman numerals, followed by arabic numerals.
Scholars often misunderstand Valentinelli's internal numbering to be the shelfmark.