Book stack Photo by Anthony Book stack FreePhoto by Anthony Free Download ▾ 4656 x3648 3840 x 3009 2560 x 2006 1920 x 1504 1280 x 1003 800 x 627 4656 x3648 3840 x 3009 2560 x 2006 1920 x 1504 1280 x 1003 800 x 627 License: Free for personal and commercial use. Not for sale or redistribution. Appreciation not required but appreciated. Facebook Twitter Camera: DMC-FZ1000 2532/100 mm f/8.0 1/13 s 125 ISO retro vintage classic stack books learn knowledge pile book stack Colors: