Two Conoco Maps, Travel Michigan and Travel Chicago and Vicinity - 1930s?

Description

Two Conoco travel maps. Both have light pencil writing on cover, see pictures for condition details. The Michigan map has a couple of tears and small fold holes. They show their age but overall are in good condition and would make nice display pieces. I think these are from the 1930's but am not sure.
Questions? Please ask. Ships as first class package.