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1. Index of USGS 100,000 Scale Quadrangles: Indiana

1999. United States Geological Survey. This dataset shows the grid index of USGS 100K quadrangles. Each polygon is attributed with the official USGS quadrangle name and index number.

2. Index of USGS 250,000 Scale Quadrangles: Indiana

1999. United States Geological Survey. This dataset shows the grid index of USGS 250K quadrangles. Each polygon is attributed with the official USGS quadrangle name and index number.

3. Purdue Campus: West Lafayette, Indiana, 1999

1999. The Purdue historical campus map collection was scanned and georeferenced by Purdue University Libraries. The physical maps were collected as Purdu...