FIG. 19. PORTION OF CHARTS OF 1869 AND 1903, OF THE PACIFIC OCEAN WEST OF THE HAWAIIAN ISLANDS, TO ILLUSTRATE THE REMOVAL OF DOUBTFUL DANGERS.
FIG. 20. PORTION OF CHART OF PONCE HARBOR, SCALE 1-20000, TO SHOW SELECTION OF SOUNDINGS FROM ORIGINAL SURVEY GIVEN BELOW.
FIG. 21. HYDROGRAPHIC SURVEY OF SAME PORTION OF PONCE HARBOR, REDUCED TO ONE-HALF SCALE OF ORIGINAL SHEET.