PURCHASE IMAGE REPRODUCTION
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PHILADELPHIA STREETS DEPARTMENT, SURVEY AND DESIGNS BUREAU
Frank Morelli
Survey Bureau Manager
Philadelphia Streets Dept.
Phone: (215) 686-5540
Email: frank.morelli@phila.gov
Plan (alternate image), Sheet No. 2. Isodynamic lines at time of maximum velocity of ebb, surveyed in May, June & July 1886. , 1888
Original size: 31 x 100 in. (estimated)