The Detroit Publishing Co. photos obtained by Shorpy from the Library of Congress are all public domain and can be used by anyone for free. Good manners, though, for any site reproducing them would be to credit the LOC.

Shorpy brightens and boosts contrast on the photos, which may give a superficial suggestion of more sharpness, but actually degrades the image a bit and introduces digital noise. The unretouched original scans can be found here. https://www.loc.gov/pictures/collection/det/