Historic image LS_0028 is part of the 'DGMR lantern slides' collection; the topic area is 'Bulletin 35'. Location is Frederick Co. (estimated). The image has the following description: 'Va. G.S. Oyster shell shields - Grand Caverns. Similar to Pl. 13 B. Bulletin 35 .' The image was scanned from a lantern slide as part of the USGS NGGDPP deliverable for 2017-2018. The physical location is 900 Natural Resources Dr., Ste 400, Charlottesville, VA 22903. Library. The author is William M. McGill. The image is dated 19330101.