The US Geological Survey (USGS) has replaced former paper offerings with digital products. The Survey cites decline in customer demand for paper prints, increasing scarcity and expense of photo-processing materials, and evolution of the photography industry as reasons for the change. Two aerial photography products are now available from the Survey, both in TIFF format: a high resolution digitally scanned image and a medium resolution digitized image. See the EROS Product Page for details regarding USGS image offerings. Research assistance and traditional paper prints of USGS aerial photographs are available from private vendors.