Encyclopedia Dubuque
"Encyclopedia Dubuque is the online authority for all things Dubuque, written by the people who know the city best.”
Marshall Cohen—researcher and producer, CNN
Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
CONOCO OIL COMPANY
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CONOCO OIL COMPANY. On June 26, 1929 Marland Oil merged with Continental Oil and Transportation Co., forming a new company known as the Continental Oil Company (Conoco). The company owned nearly 3,000 wells and thousands of retail outlets in 30 states and was headquartered in Ponca City, OK.
The 1948 Dubuque Classified Business Directory listed 100 Railroad.
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Source:
"About Us," Online: http://www.conocophillips.com/about-us/our-history/1929-1910/