Check the listing for details. 1931 Conoco Colorado Highway Road Map. Color: Multi-color, Condition: Used, Made in United States. Listed at 55.00 USD. The 1931 Conoco Colorado Highway Road Map is a vintage advertising piece that showcases the gas and oil theme of the brand. This original, multi-color map from 1929 was created by Conoco in the United States, making it a unique collectible item for enthusiasts of gas and oil memorabilia. Perfect for those interested in vintage advertising and maps from the early 20th century, this piece offers a glimpse into the past and serves as a reminder of the brand's history and significance in the industry.The 1931 Conoco Colorado Highway Road Map is a vintage advertising piece that showcases the gas and oil theme of the brand. This original, multi-color map from 1929 was created by Conoco in the United States, making it a unique collectible item for enthusiasts of gas and oil memorabilia. Perfect for those interested in vintage advertising and maps from the early 20th century, this piece offers a glimpse into the past and serves as a reminder of the brand's history and significance in the industry.