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Royalty-Free Researcher Photos, orientation: vertical, dominant color: green
2888x3696
grayscale photography of man wearing formal black suit while sitting on black armchair
Public Domain
3312x4416
two green and blue liquid filled clear glass containers
Public Domain
2848x4272
closeup photo of assorted-title books on brown wooden bookshelf
Public Domain
3072x4608
brown wooden ladder near book lot
Public Domain