According to the USGS, "A Digital Line Graph (DLG) is digital vector data representing cartographic information."
This DLG map shows hydrography (the scientific data related to water), hysography (the measurement of earth above sea level), a public land survey, and roads in the Dixie Valley of Nevada. Other data which DLG maps could show are utilities, boundaries, or other topographical features, all of which would be measured scientifically.
The link below is to reference information gained from the USGS.
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