https://catalogue-scientifique.canada.ca/record=3300590~S6*frc
Rechercher Saudi Arabia. Mudīrīyah al-ʻĀmmah lil-Tharwah al-Maʻdinīyah; Rechercher Watts, Griffis and McOuat Limited
Ministry of Petroleum and Mineral Resources, Directorate General of Mineral Resources, 1900
Publication gouvernementale