1. Joseph Pennell's pictures of the Panama Canal [Texto impreso] : reproductions of a series of lithographs made by him on the Isthmus of Panama, January March, 1912, together with impressions and notes by the artist

2. Joseph Pennell´s pictures of the Panama Canal: reproductions of a series of lithographs made by him on the isthmus of Panama, January March 1912, together with impressions and notes by the artist.