Rows in the maps are numbered 1 through 7, and columns are numbered A through D.
In the text of the
Guide to the Map, a link to the large map
looks like this: 5A.
Two addresses, as in 6A:7B,
represent the upper left and lower right panels of the area of interest. These links
will take you to the first (upper left) row and column address they name.
To return from the large map to the text, click on Back in your browser.
To return to the small map, click on the large map.