Topographic sheets. Iowa-Illinois, Rock Island quadrangle, lat. 41° 30′-42°, long. 90° 30′-91°. Scale 1:125,000, contour interval 20 feet.
Publication Title:
Iowa-Illinois, Rock Island quadrangle, lat. 41° 30′-42°, long. 90° 30′-91°. Scale 1:125,000, contour interval 20 feet.
Display Title:
Topographic sheets. Iowa-Illinois, Rock Island quadrangle, lat. 41° 30′-42°, long. 90° 30′-91°. Scale 1:125,000, contour interval 20 feet.
Corporate Agency Authors:
Geological Survey and Interior Department
Sort Author:
Geological Survey
Date:
Edition of Aug. 1901
Publish Date ISO Format:
1901-08-01T00:00:00Z
Publication Start:
19010801
Publication End:
19010831
Corporate/Agency Author:
Geological Survey
Publication month:
5
Publication year:
1901
Notes:
NOTE.—The Geological Survey is making a topographic map of the United States. The sheets of which it is composed are projected without reference to political divisions, and are designated by some prominent feature found on them. Three scales are used, 1:62,500, 1:125,000, and 1:250,000. These correspond, approximately, to 1 mile, 2 miles, and 4 miles to 1 linear inch on the map. The size, unless otherwise given, is about 17.5 inches in height by 11.5 to 16 inches in width, exclusive of the margin, the width varying with the latitude. A description of the topographic map is printed on the reverse of each sheet catalogued. About three-tenths of the area of the country, excluding Alaska, has been mapped, nearly every State being represented. Massachusetts, Connecticut, Rhode Island, New Jersey, and the District of Columbia are completely mapped. Sheets of the regular size are sold by the Survey at 5c each; but in lots of 100 or more copies, whether of the same sheet or of different sheets, the price is 2c each. Topographic sheets are frequently reprinted. These reprints have heretofore been entered in the monthly catalogue, but will hereafter be omitted, unless they vary in some way from the original. A complete list of the sheets already published may be found in Geological Survey Bulletin 177, page 67-109.
Notes:
NOTE.—The Geological Survey is making a topographic map of the United States. The sheets of which it is composed are projected without reference to political divisions, and are designated by some prominent feature found on them. Three scales are used, 1:62,500, 1:125,000, and 1:250,000. These correspond, approximately, to 1 mile, 2 miles, and 4 miles to 1 linear inch on the map. The size, unless otherwise given, is about 17.5 inches in height by 11.5 to 16 inches in width, exclusive of the margin, the width varying with the latitude. A description of the topographic map is printed on the reverse of each sheet catalogued. About three-tenths of the area of the country, excluding Alaska, has been mapped, nearly every State being represented. Massachusetts, Connecticut, Rhode Island, New Jersey, and the District of Columbia are completely mapped. Sheets of the regular size are sold by the Survey at 5c each; but in lots of 100 or more copies, whether of the same sheet or of different sheets, the price is 2c each. Topographic sheets are frequently reprinted. These reprints have heretofore been entered in the monthly catalogue, but will hereafter be omitted, unless they vary in some way from the original. A complete list of the sheets already published may be found in Geological Survey Bulletin 177, page 67-109.