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The U.S. Geological Survey's Publications Warehouse (pubs.usgs.gov) will 
complete a process to migrate all of its' on-line publications into 
Portable Document Format (PDF) files by September 1, 2011. At that time, 
the USGS will no longer support the previous DJVU format for its on-line 
publications. Libraries and Web site managers should link to the 
publications citation page for USGS publications. At sometime after 
September 1, 2011, direct links to DJVU files will stop working and there 
will be no automatic redirect to the PDF version of those materials.

A direct link to a USGS DVJU file currently looks like: 
http://pubs.er.usgs.gov/djvu/B/bull_1967.djvu
Once loaded in PDF, individual publications will have a link like this: 
http://pubs.usgs.gov/bul/1967/report.pdf

However, the preferred link to this publication is: 
http://pubs.er.usgs.gov/publication/b1967

The citation link is the preferred link because it may include links to 
plates, maps, appendices, etc. as well as links to the USGS Store to 
purchase paper copies if they are available.  This migration has been 
sought by members of the research community for some time. The DJVU format 
offered many benefits at a time when bandwidth was a challenge. The PDF 
format offers a consistent format for both historical and current 
publications and it allows users to download and use information from USGS 
publications in the same way that they use research journal articles and 
other scientific research products.

Over 70% of all USGS-published reports are available in an on-line format 
from the USGS Publications Warehouse. The system currently includes 
citations to over 100,000 research articles, reports, and products 
produced by the USGS over the last 130 years. The system also offers an 
RSS feed to keep users of earth and natural science research informed 
about the products of the USGS.

Richard Huffine, Director
USGS Libraries Program
12201 Sunrise Valley Drive, Reston, VA 20192
Tel 703-648-7182
Email: [log in to unmask]