TOPOGRAPHIC MAPS --
Topographic Maps, 1996 (1:24,000)
Scanned color images of topographic quadrangle maps (referred to as "Digital Raster Graphics" or "DRGs") produced by the U.S. Geological Survey.
To download this imagery, use the "Download > Raster Data by County or Quad" tool on the GIS Atlas for Indiana.
Generic metadata for DRGs can be viewed here.