Scale 1:2,500,000. 1 in. equals aprox. 40 miles ; Albers equal-area projection based on standard parallels 29 1/2° and 45 1/2° (W 125°--W 65°/N 50°--N 23°).
Note
Also shows county boundaries. East half includes insets for outlying areas of the United States in the Caribbean, the Canal Zone, and Puerto Rico and the Virgin Islands. West half includes insets for American Samoa, Guam, Hawaii, Alaska, and outlying islands of the United States in the Pacific.