Maps

Trails and symbols are shown clearly. A comprehensive legend appears on each map. Since each map is unique, placement of the legend varies.  
The USGS has some great science fair ideas related to earthquakes. Find inspiration for projects on other science topics by browsing the USGS Education website.
Yes. You can review all of our classroom-friendly materials by visiting the USGS Education website, where our resources are organized by grade level: Primary (K-6), Secondary (7-12), and Undergraduate.
Yes. Educational institutions qualify for discounts on purchases made through the online USGS Store. To receive any discounts you must first be set up in their system. Please fax your request on school letterhead (or on a purchase order) to 303-202-4693...
The USGS has offices in every state, but it does not have employees who go into the classroom as part of their job. Some employees, however, are willing to do so on their own time. If there is a USGS office in your town, you can try asking them.
The USGS does not have a formal program for teacher workshops, but USGS scientists sometimes participate in teacher workshops that are organized by universities or other education groups.
The USGS Field Records Library in Denver, Colorado, has an extensive collection of materials. Many of the field records are online at http://www.cr.usgs.gov/. You may contact them at: USGS Field Records LibraryBox 25046, MS 914Denver Federal...
That depends on what kind of reprojection you want to do. In some cases, if you want to reproject from one datum to another (specifically NAD 27 to NAD 83 or NAD 83 to NAD 27), a simple xy shift will suffice. This shift will not introduce measurable...
If coordinates are to be passed on to another person it is technically necessary to report the horizontal datum and the latitude/longitude of the point (e.g. NAD 27 CONUS, 44 degrees, 7 minutes, 30 seconds north/ 104 degrees, 15 minutes, 10 seconds west...
Generally, for the conterminous United States, the North American Datum (NAD) shift amounts to about 210 meters. This shift occurs because of the change in shape of the spheroid used to define the datum. The GRS 80 spheroid (used for NAD 83) is shorter...