Historic Aerials, a Division of Nationwide Environmental Title Research, LLC
http://www.historicaerials.com
Free viewing of an increasingly large database of historic aerial photographs for the United States. A comparison slide-bar allows you to overlay photographs from two different years. The free view has watermarks, but still very, very helpful. Images are available for purchase; the system to select which years you want is straightforward, and the costs are reasonable. Downloaded aerials are georeferenced.Library of Congress Map Collections
http://lcweb2.loc.gov/ammem/gmdhtml/gmdhome.html
The LOC collection is subdivided into several categories. Search from this main page to get results that span all of the map collections. Searching by state will pull up all entries. Images are available for viewing/downloading in MrSID and jpeg2000. More information on these technologies and links to download MrSID (no longer supported, but available) is at the LOC Help Page http://lcweb2.loc.gov/ammem/help/compression.html.MyTopo: Historical Topographic Maps
http://historical.mytopo.com/
A growing library of historical USGS topographic maps. You can search from this page either by Quad, Town, or visually. Nice, intuitive interface for finding various years, adjacent, and at different scales. High quality scans; download 1/4 of a full topo at a time. Currently holdings for CT, DE, ME, MD, MA, NH, NJ, NY, OH, PA, RI, VT, VA, WV.
Prince George's County GIS
http://www.pgatlas.com/pgatlas/
This site runs a system check to ensure you can view all its bells and whistles. I was not able to run it in Firefox, but had no trouble with it in Internet Explorer (you need to allow pop-ups for this site). Tabs to the various layers are available on the left side of the screen. Click "Imagery" for historic aerial photos (1938-2007) and the 1861 Martinet map. Click "Historic Features" for National Register properties.
Sanborn Fire Insurance Maps of New Jersey at Princeton University
http://library.princeton.edu/libraries/firestone/rbsc/aids/sanborn/atlantic/absecon.html
The link takes you to the Absecon, NJ maps. There is no overview webpage for the Sanborn map collection; this link opens an Excel spreadsheet finding aid with clickable links to the years and locations that maps are available for. The nice thing about these Sanborns is that they are in color, providing additional details about building construction, etc.
New York State Historical Maps via SUNY-Stony Brook
http://www.sunysb.edu/libmap/nymaps.htm
A nice collection of digital images and full bibliographic information (click on the date of the map) from an assortment of repositories. Dates range from 1556 through 1895. Nearby states (NJ, PA, CT, etc.), regions (New England, New France, New Netherlands, British North America), and countries (Canada) are also included in some of these. A very, very nice regional collection of early maps (and in color!).Long Island T-Charts (U.S. Coastal and Geodetic Survey), 1830s-1890s, via SUNY-Stony Brook
http://libmedia.cc.stonybrook.edu/cdm4/browse.php?CISOROOT=%2Fp3006coll44
T-Charts are fantastic references if your area of research is coastal, or along a major waterway. They are often extremely detailed, with roadways, structures, land forms, vegetation, etc. Particularly handy for the 1830s and 1840s, before the Atlas Craze hit in the mid-nineteenth century. Read about the SUNY-Stony Brook collection: http://www.stonybrook.edu/library/map/licoast.html.
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