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- The Survey4
- State of Md., Dept. of Natural Resources, Md. Geological Survey, Williams & Heintz Map Corp.)2
- Direcção Geral de Minas e Serviços Geológicos1
- Geological Survey1
- Geological Survey Dept1
- Iowa Geological Survey1
- Kentucky Geological Survey1
- Minnesota Geological Survey, University of Minnesota1
- The Survey : [Books and Open-File Reports Section, distributor]1
- The Survey ; For sale by Map Distribution1
