photos-of-san-francisco-in-the-1960s...1900

http://news.buzzbuzzhome.com/2016/02/16-groovy-photos-of-san-francisco-in-the-1960s.html

http://www.sfgate.com/bayarea/article/Cool-zoomable-map-of-San-Francisco-in-1938-Find-9000510.php

http://www.rodhandeland.com/CallBldg1897Color.jpg-
https://en.wikipedia.org/wiki/Central_Tower_(San_Francisco)

https://en.wikipedia.org/wiki/List_of_tallest_buildings_in_San_Francisco#History