Modern colorful animation wallpaper ... Nature sunrise, mountain trees and aerial view of the forrest and beautiful scenic in the outdoors. Drone and natural sunny landscape background of the ...

IN an earlier communication 1, an account was given of the bactericidal action of lactic acid vapour. Further work has shown that the methods of vaporization used until that time were inefficient ...

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Browse 70,400+ laptop wallpaper stock illustrations and vector graphics available royalty-free, or search for desktop to find more great stock images and vector art. A portable neon computer with a ...