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http://nsdl.org/contribute/?pager=developers An overview of information links for resource and collection contributors to NSDL and developers wishing to learn more about our technical services...

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The Open Publication Distribution System (OPDS) Catalog specification is a syndication format for electronic publications based on Atom RFC4287 and HTTP RFC2616 . All of the formal versions of the OPDS Catalog specifications are available on the specifications page . What are OPDS Catalogs? http://opds-spec.org/about/
http://www.pearltrees.com/kaamitch/metadata/id2702337
www.pearltrees.com
crawl=CC-MAIN-2013-20
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application/http; msgtype=response
sha1:GTFJW6L43RRGLHBAQ4OVEF7FFKLVDYOJ
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2013-05-24T07:01:39Z
93.184.35.40
sha1:FEUA2ZHZERNN6PWR7VXTWFSD2CJR55KA
<urn:uuid:69b36beb-2e1e-4b23-af28-4fd656d95585>
http://www.pearltrees.com/kaamitch/metadata/id2702337
response
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robots: classic
hostname: ip-10-60-113-184.ec2.internal
software: Nutch 1.6 (CC)/CC WarcExport 1.0
isPartOf: CC-MAIN-2013-20
operator: CommonCrawl Admin
description: Wide crawl of the web with URLs provided by Blekko for Spring 2013
publisher: CommonCrawl
format: WARC File Format 1.0
conformsTo: http://bibnum.bnf.fr/WARC/WARC_ISO_28500_version1_latestdraft.pdf