The catalogue raisonné lists 350 works by the artist. It is organized chronologically, and is further divided into sections: original works and works of uncertain date; unexamined but possible original works; untraced original works documented by copies or engravings; works by artist's brother, P. A. Guercino; works done close to the artist's circle or replicas; and attributed works that are doubtful, rejected, or unlocated.