Magnolia Petroleum Company - Road Maps of the SouthWest
Magnolia Petroleum Company - Southwest Road Maps
Magnolia Petroleum Company - Southwest Maps - Prewar Front
Magnolia Petroleum Company - Southwest Maps - Prewar Back
Magnolia Petroleum Company - Southwest Maps - Postwar Front
Magnolia Petroleum Company - Southwest Maps - Postwar Back
Magnolia Petroleum Company made individual state maps of the southwestern states from 1928 to 1935 and then started publishing the Southwest map series in 1936. Mobil kept the Southwest map series going until 1966 when it was discontinued. I believe this is a complete year set of maps for Magnolia Petroleum and Mobil Southwest maps.
The following clickable link will open a Check-List type Spreadsheet that will include Map Codes, Copyright Dates and other descriptive information for the above pictured map series. Magnolia-SouthWest-Spreadsheet