Description elaborated by Vicente Fraile Castellano and Rosa Isusi-Fagoaga during the 2011 project to catalogue music holdings at the Real Colegio Seminario de Corpus Christi in Valencia, financed by CulturArts. Música; the catalogue is available through Biblioteca Valenciana http://www.bv.gva.es. Rosa Isusi Fagoaga, who very generously sent us the descriptions of all these polyphonic choirbooks at E-VAcp, is preparing a publication about them:

"Palestrina, Giovanni Pierluigi da (1526-1594)
Motettorum quatuor vocibus. Liber secundus [Música notada] / Ioan Petraloysii Praenestini. -- Venetiiss : Apud haeredem Hieronymi Scoti, 1588, 6 partes ; 23 cm
   Encuadernado junto a: Liber Primus Motectorum quae partim quinis / Ioan Petraloysii Praenestini ; Mottettorum, qua partim quinis[...] Liber secundus / Ioani Petraloysii Praenestini ; Mottettorum quae partim quinis [...] Liber tertius / Ioani Petraloysii Praenestini ; Mottetorum quinq. vocibus. Liber quartus, ex canticis salomonis / Ioani Petraloysii Praenestini
   Se trata de 28 motetes a 4 voces
   Texto en latín
   Partes de Canto ; Alto ; Tenor ; Bajo ; Quinta voz ; Sexta voz
   Encuadernado en pergamino
   Las partes de Quinta y Sexta voz no contienen la obra: "Motettorum quatuor. Liber secundus". La parte de Sexta voz tampoco contiene: "Mottetorum quinq. vocibus. Liber quartus, ex canticis salomonis&quot."

See also Printed Sacred Music Database: http://www.printed-sacred-music.org/manuscripts/00000000002476

Bound "Bassus" partbook with the bassus parts of the following seven publications, five by Palestrina and two by Vincenzo Ruffo:

Palestrina:
1. Liber primus...mottettorum, quae partim quinis, partim senis, partim septenis vocibus concinantur (Venezia: erede di Girolamo Scotto 1586) [RISM P702]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002469

2. Motettorum quae partim quinis, partim senis, partim octonis vocibus concinantur, liber secundus (Venezia: erede di Girolamo Scotto 1580) [RISM P708]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002475

3. Motettorum quae partim quinis, partim senis, partim octonis vocibus concinantur, liber tertius (Venezia: erede di Girolamo Scotto 1581) [RISM P712]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002479

4. Motettorum quinque vocibus liber quartus (Venezia: Vincenti, Giacomo 1588) [RISM P719]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002486​

5. Motettorum quinque vocibus liber quintus (Venezia: erede di Girolamo Scotto 1588) [RISM P729]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002495​

Vincenzo Ruffo:
6. Sacrae modulationes...(vulgo motecta) quae potissimos totius anni festos dies comprehendunt et senis vocibus concinuntur...liber primus (Brescia: Marchetto, Pietro Maria 1583) [RISM R3062a]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002842

7. Sacrae modulationes vulgo motecta, quae potissimos totius anni festos dies comprehendunt et senis vocibus concinuntur...liber secundus (Brescia: Marchetto, Pietro Maria 1583) [RISM R3062b]. See Printed Sacred Musica Database: http://www.printed-sacred-music.org/manuscripts/00000000002793

This Bassus partbook is preserved in this library together with two other volumes with the Cantus and Altus parts of the same seven publications; see E-PAMcap LP1 and E-PAMcap LP2. All three partbooks, not listed in RISM, have the ex libris of father José Antonio Donostia (1886-1956).