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41. Global GIS : Railroads

Line Harvard University Restricted content
1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing railroads worldwide and was published as part of the USGS Global GIS : global coverage database.... American Geological Institute.

42. Global GIS : Roads

Line Harvard University Restricted content
1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing major roads and trails worldwide and was published as part of the USGS Global GIS : global cover... American Geological Institute.

43. Global GIS : Smaller rivers and streams

Line Harvard University Restricted content
1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing smaller rivers and streams worldwide and was published as part of the USGS Global GIS : global c... American Geological Institute.

44. Global GIS : Springs, wells and dams

Point Harvard University Restricted content
1997. United States. National Imagery and Mapping Agency. This datalayer is a point coverage representing the locations of springs/water holes/wells, dams/weirs, river rapids, and waterfalls worldwide and ... American Geological Institute.

45. Global GIS : Storage points

Point Harvard University Public content
1997. United States. National Imagery and Mapping Agency. This datalayer is a point coverage representing worldwide storage point features and was published as part of the USGS Global GIS : global coverage... American Geological Institute.

46. Global GIS : Utility line features

Line Harvard University Restricted content
1997. United States. National Imagery and Mapping Agency. This datalayer is a polyline coverage representing various utility line features (including pipelines, power transmission lines and communication l... American Geological Institute.

47. Global GIS : Utility point features

Point Harvard University Public content
1997. United States. National Imagery and Mapping Agency. This datalayer is a point coverage representing worldwide utility point features and was published as part of the USGS Global GIS : global coverage... American Geological Institute.

48. Global GIS : World faults

Line Harvard University Restricted content
1996. Environmental Systems Research Institute (Redlands, Calif.) and Geological Survey (U.S.). This datalayer is a polyline coverage representing earthquake faults worldwide. It was originally produced by ESRI and the USGS for the Global GIS ... American Geological Institute.

49. Arctic Ice Chart, April 1, 1982

Polygon Stanford University Public content
1982. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1982. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).

50. Arctic Ice Chart, April 1, 1984

Polygon Stanford University Public content
1984. Arctic Climate System (ACSYS). This polygon shapefile contains ice observations in the Arctic region for April 1, 1984. This layer is part of the Arctic Climate System (ACSYS) Hi... Arctic Climate System (ACSYS).