To change view, select desired zoom level and window size from the options below the Zoom View window and then click on the image. The display will be centered where you click. To move up, down, left, or right within a zoom level, click near the edge of the image in the Zoom View or select an area in the Navigator View. The red box on the Navigator View indicates the area of the image being viewed in the Zoom View.

CREDIT: Page, Thomas Hyde, Sir. " Boston, its environs and harbour, with the rebels works raised against that town in 1775, from the observations of Lieut. Page of His Majesty's Corps of Engineers, and from those of other gentlemen." 1775? Map Collections, 1639-1988: Military Battles and Campaigns, Library of Congress.