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Set of 10 unbelievable SAN FRANCISCO historic panoramic views. Check how city looked like before gold rush. Everything in extreme resolution up to 500megapixels. Perfect XIX century drawings on iPad with 2500% zoom - let you study all details created by lithographers.
appadvice.com: "the level of detail, high resolution, and “zoomability” of the maps in this app can’t so easily be found elsewhere."