Topographic quadrangle maps. Iowa-Illinois. Silvia quadrangle. lat. 41°30′-41°37′30″, long. 90°22′30′-90°30′. Scale 1:24,000, contour interval 10 ft. n. p.
Publication Title:
Iowa-Illinois. Silvia quadrangle. lat. 41°30′-41°37′30″, long. 90°22′30′-90°30′. Scale 1:24,000, contour interval 10 ft. n. p.
Display Title:
Topographic quadrangle maps. Iowa-Illinois. Silvia quadrangle. lat. 41°30′-41°37′30″, long. 90°22′30′-90°30′. Scale 1:24,000, contour interval 10 ft. n. p.
Series Title:
Topographic quadrangle maps.
Corporate Agency Authors:
Geological Survey and Interior Dept.
Sort Author:
Geological Survey
Date:
edition of 1949
Publish Date ISO Format:
1949-01-01T00:00:00Z
Publication Start:
19490101
Publication End:
19491231
Corporate/Agency Author:
Geological Survey
Publication month:
13
Publication year:
1949
SuDoc number:
I 19.12:15 Si 39/949
Description:
23X17 in.
Notes:
[Map covers only a portion of the sheet. Text on reverse. Prepared in cooperation with Illinois Registration and Education Department and Geological Survey Division.] and NOTE.—The Geological Survey makes contoured maps—three-dimension topographic maps which are designed eventually to cover the whole United States and Alaska. The individual maps are projected to represent quadrangle areas rather than political divisions, and each map is designated by the name of some prominent town or natural feature within that area. About half of the continental area of the country, excluding Alaska, has been mapped, every State being represented. Connecticut, Delaware, the District of Columbia, Hawaii, Maryland, Massachusetts, New Hampshire, New York, Ohio, Puerto Rico, Rhode Island, and West Virginia are completely mapped. Index maps showing topographic maps published for each State are available without cost on request to The Director, Geological Survey. Except as otherwise indicated, a discount of 20 percent is allowed on an order for maps, or for maps and geologic folios, that amounts to $10,000 at the retail price. In ordering, give the name and scale of each map and the State in which the area lies.
Notes:
NOTE.—The Geological Survey makes contoured maps—three-dimension topographic maps which are designed eventually to cover the whole United States and Alaska. The individual maps are projected to represent quadrangle areas rather than political divisions, and each map is designated by the name of some prominent town or natural feature within that area. About half of the continental area of the country, excluding Alaska, has been mapped, every State being represented. Connecticut, Delaware, the District of Columbia, Hawaii, Maryland, Massachusetts, New Hampshire, New York, Ohio, Puerto Rico, Rhode Island, and West Virginia are completely mapped. Index maps showing topographic maps published for each State are available without cost on request to The Director, Geological Survey. Except as otherwise indicated, a discount of 20 percent is allowed on an order for maps, or for maps and geologic folios, that amounts to $10,000 at the retail price. In ordering, give the name and scale of each map and the State in which the area lies. † Distribution Made by Issuing Office. 20c. each (except Alaska, 25c.)
Availability:
† Distribution Made by Issuing Office. 20c. each (except Alaska, 25c.)