Columbia subject headings:
Baltimore (Md.)--History--19th century.
City planning--California--San Francisco--History.
City planning--Maryland--Baltimore--History.
San Francisco (Calif.)--History--19th century.
Social change--Environmental aspects.
Harvard subject headings:
Baltimore (Md.)--History--19th century.
City planning--California--San Francisco--History.
City planning--Maryland--Baltimore--History.
San Francisco (Calif.)--History--19th century.
Social change--Environmental aspects.
Princeton subject headings:
Baltimore (Md.)--History--19th century.
City planning--California--San Francisco--History.
City planning--Maryland--Baltimore--History.
San Francisco (Calif.)--History--19th century.
Social change--Environmental aspects.