Basilius Magnus: De legendis antiquorum libris, sive De liberalibus studiis (Tr: Leonardus Brunus Aretinus). -- [Logroño : Arnaldo Guillen, de Brocar, about 1502-05]. -- 4°
Dated by Norton. GW and Haebler assigned to Brocar at Pamplona. -- Bibliographical References: Haeb(BI) 45; Vindel(A) VI 239: 23; Norton(1978) 379; GW 3718
ISTC 

Breviarium Pampilonense (Pamplona), noviter correctum et emendatum. -- [Logroño : Arnaldo Guillen, de Brocar, about 1502]. -- 4°
Bibliographical References: Vindel(A) VI 245: 26; Norton(1978) 368; IBE Post-incunables 60; GW 0541930N
ISTC 

Enciso, Rodrigo de: De amicitia vera et ficta. -- [Logroño : Arnaldo Guillen, de Brocar, about 1502-05]. -- 4°
Bibliographical References: Haeb(BI) 243; Vindel(A) X p.14; Norton(1978) 378; IBE Post-incunables 98; Adams E172; Martín Abad p.327; GW 9303
ISTC 

Ferdinandus et Isabella, reges Hispanienses: Capitulos de governadores, corregidores. ... 9 de Junio 1500. -- [Logroño : Arnaldo Guillen, de Brocar, about 1513]. -- f°
Assignment to printer from Norton. Assigned tentatively to Salamanca in Goff. -- Bibliographical References: Goff F70; Norton(1978) 422; Martín Abad p.227; GW VIII Sp.319b
ISTC 

Ferdinandus et Isabella, reges Hispanienses: Cuaderno de las leyes nuevas de la hermandad, 1486. -- [Logroño : Arnaldo Guillen, de Brocar?, not before 1502]. -- f°
Assignment to printer from GW. -- Bibliographical References: Goff F78; Haeb(BI) 184; Vindel(A) VIII 47: 18; GW VIII Sp.307a
ISTC 

Persius Flaccus, Aulus: Satyrae. -- [Logroño : Arnaldo Guillen, de Brocar, about 1510]. -- 8°
Bibliographical References: Vindel(A) VIII 54: 25 and p.XXIX; Norton(1978) 410; IBE Post-incunables 198; GW M3130810
ISTC 

Proba Falconia: Carmina, sive Centones Vergilii. -- [Logroño : Arnaldo Guillen, de Brocar, about 1507]. -- 4°
Dated from IBE. -- Bibliographical References: Haeb(BI) II 258bis; Norton(1978) 381; J. Lopez de Toro, Un impreso riojano de Arnao Guillén de Brocar, desconocido in Boletín de la Dirección General de Archivos y Bibliotecas, VI (1957), 41, pp. 4-6 ; IBE Post-incunables 215; Martín Abad p.644
ISTC 

Pulgar, Fernando de: Coplas de mingo revulgo glosados por Fernando de Pulgar. -- [Logroño : Arnaldo Guillen, de Brocar, about 1502-05]. -- 4°
Attributed to printer by Norton. -- Bibliographical References: Goff P1131; Hisp p.168; Norton(1978) 377
ISTC 

Statuta Auscitana (Auch): Constitutiones provinciales Auxi. Constitutiones synodales Aquensia (Dax). -- [Pamplona] : Arnaldo Guillen, de Brocar, [after 1499]. -- 8°
Perhaps printed after Guillen's move to Logroño in 1501. -- Bibliographical References: Péligry 285; GW M4345150
ISTC 

Verinus, Michael: Disticha. Prelim: Angelus Politianus, Nicolaus Seraticus, Bernardus Michelotius, Antonius Geraldinus, Hieronymus, Carmina in obitu Michaelis Verini. -- [Logroño : Arnaldo Guillen, de Brocar?, after 1500]. -- 4°
Haebler considered Italy to be a more likely place of printing.

See García-Cervigón del Rey, Inmaculada; Martín Baños, Pedro: Un volume facticio con impresos tempranos españoles en la Biblioteca Comunale de Palermo. In: Revista de literatura medieval 35 (2023) p. 197–228. . -- Bibliographical References: R 1891; Haeb(BI) 672(5); IGI V p. 304; GW M50157
ISTC