Royalty-Free Research Photos, orientation: horizontal, dominant color: gray
- 6000x4000 Public Domain
- 5184x3456 Public Domain
- 3456x2304 Public Domain
- 5184x3456 Public Domain
- 2100x1350 Public Domain
- 4924x4924 Public Domain
- 7360x4912 Public Domain
- 5616x3744 Public Domain
- 3000x2000 Public Domain
- 1920x1280 Public Domain
- 3424x2739 Public Domain
- 5472x3648 Public Domain
- 3872x2592 Public Domain