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  1. Pennsylvania, Gettysburg, Battle of Gettysburg, tree and battlefield monument, dawn
  2. School supplies
  3. Arteries of the brain, 3D CT scan
  4. Lena Delta - USGS Earth as Art
  5. Pair of human hands on black background.
  6. Wilson Dam, Flood Gates
  7. Arthritis of the knee, X-ray
  8. Indigo Agate D
  9. Wright Flyer sculpture at Wright Brothers National Memorial, North Carolina
  10. Dental X-ray
  11. Normal shoulder, X-ray
  12. RMS Titanic being moved out of drydock, March 6, 1912
  13. William Edward Burghardt Du Bois, African-American Scholar And Civil Rights Activist
  14. Replica Of Eli Whitney's Cotton Gin
  15. Newsboy Ned Parfett announcing the sinking of the 'Titanic' on April 16, 1912
  16. Hampton Institute, 1899
  17. Close-Up Of Fortification Laguna Agate
  18. Christmas Jasper
  19. Rib cage and heart, 3D CT scan
  20. Sioux Dance, 1890
  21. Conversion
  22. Kentucky - USGS State Mosaic
  23. Caduceus and graph
  24. Arkansas - USGS State Mosaic
  25. Paisley Agate
  26. Poppy Jasper
  27. Portrait Of Ida B. Wells Barnett, 1893
  28. Parana River Delta - USGS Earth as Art
  29. Sagenite On Mexican Agate
  30. Science classroom
  31. The Summer Road
  32. Utah - USGS State Mosaic
  33. Oregon, Owyhee. Close-up of picture jasper stone
  34. Blues Guitarist And Singer Rosetta Tharpe Playing Steel Guitar
  35. Scanning electron micrograph of HIV particles infecting a human H9 T cell
  36. Siberian Ribbons - USGS Earth as Art
  37. Interiors of a library, Peabody Institute, Johns Hopkins University, Baltimore, Maryland
  38. Australia, Northern Territory, Arnhem Land, Mt Borradaile, rock paintings
  39. Andes - USGS Earth as Art
  40. Rice Terraces, Longsheng Ping'an, Guangxi
  41. Idaho - USGS State Mosaic
  42. Knight's armor
  43. Abraham Lincoln, 1809
  44. Pencils
  45. Minnesota - USGS State Mosaic
  46. Richat Structure - USGS Earth as Art
  47. If I Were A Cloud
  48. Oregon. Close-up of Graveyard Point Plume Agate stone