[Map - Transcontinental Rail and Air Route Between New York and Los Angeles and San Francisco]
Transparency
[Map - Transcontinental Rail and Air Route Between New York and Los Angeles and San Francisco]
From "Transportation"
Collodion silver transparency
Overall: 3 1/4 × 4 in. (8.3 × 10.2 cm)
Gift of the 3M Foundation, ex-collection Louis Walton Sipley
