Royalty-Free Scientific Photos, dominant color: gray
- 3672x2448 Public Domain
- 5472x3648 Public Domain
- 5000x3333 Public Domain
- 3648x5472 Public Domain
- 5267x3511 Public Domain
- 6016x4016 Public Domain
- 3264x2448 Public Domain
- 2272x1704 Public Domain
- 5652x3768 Public Domain
- 2100x1350 Public Domain