<ref>[http://books.google.fr/books?id=waDSBKfl-w4C&pg=PA44&dq=Fig.+4+American+theatre,+built+in+1823,+from+the+Zimpel+map+(1834)&hl=fr&sa=X&ei=LBxgUcDrMdCv7AbghYDABA&ved=0CDMQ6AEwAA#v=onepage&q=Fig.%204%20American%20theatre%2C%20built%20in%201823%2C%20from%20the%20Zimpel%20map%20(1834)&f=false] Fig. 4 American Theatre, built in 1823, from the Zimpel map (1834)</ref> <ref>[http://books.google.fr/books?id=waDSBKfl-w4C&pg=PA68&dq=Fig.+3.+Canal+and+Banking+Company.+From+Zimpel's+map+(1834)&hl=fr&sa=X&ei=KCtgUYWfBNOQ7Aauq4HwAQ&ved=0CDUQ6AEwAA#v=onepage&q=Fig.%203.%20Canal%20and%20Banking%20Company.%20From%20Zimpel's%20map%20&f=false] p 68. Fig. 3. Canal and Banking Company. From Zimpel's map (1834)</ref> | <ref>[http://books.google.fr/books?id=waDSBKfl-w4C&pg=PA44&dq=Fig.+4+American+theatre,+built+in+1823,+from+the+Zimpel+map+(1834)&hl=fr&sa=X&ei=LBxgUcDrMdCv7AbghYDABA&ved=0CDMQ6AEwAA#v=onepage&q=Fig.%204%20American%20theatre%2C%20built%20in%201823%2C%20from%20the%20Zimpel%20map%20(1834)&f=false] Fig. 4 American Theatre, built in 1823, from the Zimpel map (1834)</ref> <ref>[http://books.google.fr/books?id=waDSBKfl-w4C&pg=PA68&dq=Fig.+3.+Canal+and+Banking+Company.+From+Zimpel's+map+(1834)&hl=fr&sa=X&ei=KCtgUYWfBNOQ7Aauq4HwAQ&ved=0CDUQ6AEwAA#v=onepage&q=Fig.%203.%20Canal%20and%20Banking%20Company.%20From%20Zimpel's%20map%20&f=false] p 68. Fig. 3. Canal and Banking Company. From Zimpel's map (1834)</ref> |