IHAPI is an interactive index that helps researchers identify aerial photographs that might be useful to them, but unfortunately it does not provide digital access to all of them. However, it does offer some insights on where to retrieve them from.
The Indiana Geological and Water Survey (IGWS) has served the people of Indiana since 1837. Established in Indiana Statute in 1993 as an institution of Indiana University, and under the direction of the Office of the Vice Provost for Research, the IGWS is committed to providing unbiased and reliable earth science information through directed research, service, and education.
The Indiana Spatial Data Portal (ISDP) provides access to more than 30 terabytes of Indiana geospatial data. Available statewide datasets include aerial photos, topographic maps, LiDAR and elevation data, and Sanborn historic maps. In addition, the ISDP hosts several local datasets for Allen, Bartholomew, Boone, Dearborn, Gibson, Hamilton, Hancock, Hendricks, Johnson, Marion, Monroe, Morgan, Posey, Shelby and Wayne Counties.
Scroll down and click on "Bloomington Historical Aerial Imagery Viewer." View aerial maps of the city of Bloomington for 1949 and 1961 via the Monroe County GIS division. They are high resolution images presented in a modern, tiled format.