Waterfronts 18 History 5 City planning 3 Feasibility studies 3 Harbors 2 Hotels 2 Land grants 2 more ... Planning 2 Urban renewal 2 Antiquities 1 Archaeological surveying 1 British 1 Buildings, structures, etc 1 Capitols 1 City planning districts 1 Cityscapes 1 Civic improvement 1 Commerce 1 Condominiums 1 Delaware Avenue 1 Economic conditions 1 Etching 1 Excavations (Archaeology) 1 Feasilility studies 1 Fires 1 Forts and fortifications 1 Histoire 1 Historic buildings 1 Historic districts 1 Historic sites 1 Land use 1 Marinas 1 Marine terminals 1 Old City (Philadelphia, Pa.) 1 Parks 1 Peddlers 1 Philadelphia (Pa.) 1 Piers 1 Piers & Wharves 1 Piers & wharves 1 less ...