Taken in December of either 1902 or 1903…

1900s Newsstand

For an image with considerably more detail, one in which you can actually read the titles, go to:

http://www.shorpy.com/node/7392?size=_original

UPDATE. [01-01-10] The Internet is wonderful. The copy of Scientific American along the top right edge of the extended newsstand is dated 13 December 1902. See below:

SCIENTIFIC AMERICAN 13 December 1903