The Panama-Pacific International Exposition, shown here in photographs that appeared in the September 4, 1915, issue of Good Roads magazine, was the focus of promotion by the National Old Trails Road Association, the Lincoln Highway Association, and others.

The Panama-Pacific International Exposition, shown here in photographs that appeared in the September 4, 1915, issue of Good Roads magazine, was the focus of promotion by the National Old Trails Road Association, the Lincoln Highway Association, and others.