Guillermo has appeared in 45 comics since 1973. The most recent cataloged appearance dates to 2008. Most cataloged appearances come from Mafalda.
Ediciones de la Flor
8 issues
Adriano Salani Editore
5 issues
RCS MediaGroup
1 issue
11 issues
Éditions Glénat
14 issues
12 issues
Glenat Italia
80 issues
Burulan
21 issues
Lumen
9 issues
La Repubblica / L'Espresso
60 issues
Mafalda & Friends (2004)
Magazzini Salani
Il Mondo di Mafalda (1994)
Mafalda 2a. Serie (2004)
Quino (1982)
Mafalda (1985)
Angel
Raquel
Miguel Pitti
Susana Beatriz Chirusi
Manuel Goreiro
Libertad
Mafalda
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