May be of interest; the following are from responses I have
sent out recently to reference/research inquiries here in the
Denver library:
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Latest version of USGS Fact Sheet:
US Topographic Maps for the Nation:
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To find aerial and satellite imagery:
Sources by Topic:
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GIS sources:
Selected examples:
Geologic map of the Jefferson quadrangle, Park and Summit
Counties, Colorado
- to preview how the map falls on Earth, select the globe
near the bottom left corner of the Google index map
- note the map is available to download in four formats:
geopdf, geotiff, jpeg, and Google Earth KMZ files
Geologic map of the Denver West 30' x 60' quadrangle,
north-central Colorado
- to preview how the map falls on Earth, select the
globe near the bottom left corner of the Google index map
- note the map is available to download in four
formats: geopdf, geotiff, jpeg, and Google Earth KMZ files
Petroleum systems and assessment of undiscovered oil and
gas in the Denver Basin Province, Colorado, Kansas,
Nebraska, South Dakota, and Wyoming -- USGS Province 39
search = Texas and GIS files:
Example:
Water-level altitudes 2012 and water-level changes in the
Chicot, Evangeline, and Jasper aquifers and compaction
1973-2011 in the Chicot and Evangeline aquifers,
Houston-Galveston region, Texas
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Google Earth files:
Earthquake Hazards Program:
Watersheds:
Minerals, Mineral Occurrences:
Geologic Maps:
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Lastly, this came up a few times this week about the
location of the USGS Seamless Server - the USGS Seamless
Server went off-line a few years ago; please refer to "The
National Map Viewer" to access the seamless content:
http://nationalmap.gov/viewer.html
Let me know if you are looking for additional
information;
Enjoy the day!
Emily
U.S. Geological Survey