and similar maps and charts have been professionally unfolded and flattened using humidity baths
are quickly and crudely unfolded for the low-quality photos you see
Extensive depth soundings
This chart does not have a neatline
Preliminary Chart of Portsmouth Harbor New Hampshire Pacific States and similar maps and chartsChart of Portsmouth Harbor, New Hampshire, and Maine. Shows great inland detail of farmland, roads, vegetation, buildings, towns, settlements, etc. Depth soundings, shoals, bottom conditions, lighthouses, aids, and hazards to navigation are shown for the harbor and approaches. Extensive details of various bays, islands, rocks, inlets, rivers, creeks, and ponds. Sailing directions, dangers, notes, and tidal information are also given. IMPORTANT NOTE: