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United States, Bureau of Land Management Tract Books DGS 7109966 12 Land Tract Page 1.jpg|thumb|left|845px|

Example tract book headings, left page.

]] [[Image:United States, Bureau of Land Management Tract Books DGS 7109966 12.jpg|thumb|right|845px|

Example tract book headings, right page.

DGS stands for Digital Genealogical Society also known as an Image Group Number. Each set of digital images is assigned a DGS number for identification purposes.