Name
Type
URL
Web Size (GBs)
National Climatic Data Center (NOAA) Public http://www.ncdc.noaa.gov/ol/satellite/satelliteresources.html
366,000
NASA EOSDIS Public http://harp.gsfc.nasa.gov/~imswww/pub/imswelcome/plain.html
219,600
National Oceanographic (combined with Geophysical) Data Center (NOAA) Public/Fee http://www.nodc.noaa.gov/, http://www.ngdc.noaa.gov/
32,940
Alexa Public (partial) http://www.alexa.com/
15,860
Right-to-Know Network (RTK Net) Public http://www.rtk.net/
14,640
MP3.com Public http://www.mp3.com/
4,300
Terraserver Public/Fee http://terraserver.microsoft.com/
4,270
HEASARC (High Energy Astrophysics Science Archive Research Center) Public http://heasarc.gsfc.nasa.gov/W3Browse/
2,562
US PTO - Trademarks + Patents Public http://www.uspto.gov/tmdb/, http://www.uspto.gov/patft/
2,440
Informedia (Carnegie Mellon Univ.) Public (not yet) http://www.informedia.cs.cmu.edu/
1,830
Alexandria Digital Library Public http://www.alexandria.ucsb.edu/adl.html
1,220
JSTOR Project Limited http://www.jstor.org/
1,220
10K Search Wizard Public http://www.tenkwizard.com/
769
UC Berkeley Digital Library Project Public http://elib.cs.berkeley.edu/
766
SEC Edgar Public http://www.sec.gov/edgarhp.htm
610
US Census Public http://factfinder.census.gov
610
NCI CancerNet Database Public http://cancernet.nci.nih.gov/
488
Amazon.com Public http://www.amazon.com/
461
IBM Patent Center Public/Private http://www.patents.ibm.com/boolquery
345
NASA Image Exchange Public http://nix.nasa.gov/
337
InfoUSA.com Public/Private http://www.abii.com/
195
Betterwhois (many similar) Public http://betterwhois.com/
152
GPO Access Public http://www.access.gpo.gov/
146
Adobe PDF Search Public http://searchpdf.adobe.com/
143
Internet Auction List Public http://www.internetauctionlist.com/search_products.html
130
Commerce, Inc. Public http://search.commerceinc.com/
122
Library of Congress Online Catalog Public http://catalog.loc.gov/
116
Sunsite Europe Public http://src.doc.ic.ac.uk/
98
Uncover Periodical DB Public/Fee http://uncweb.carl.org/
97
Astronomer's Bazaar Public http://cdsweb.u-strasbg.fr/Cats.html
94
eBay.com Public http://www.ebay.com/
82
REALTOR.com Real Estate Search Public http://www.realtor.com/
60
Federal Express Public (if shipper) http://www.fedex.com/
53
Integrum Public/Private http://www.integrumworld.com/eng_test/index.html
49
NIH PubMed Public http://www.ncbi.nlm.nih.gov/PubMed/
41
Visual Woman (NIH) Public http://www.nlm.nih.gov/research/visible/visible_human.html
40
AutoTrader.com Public http://www.autoconnect.com/index.jtmpl/?LNX=M1DJAROSTEXT
39
UPS Public (if shipper) http://www.ups.com/
33
NIH GenBank Public http://www.ncbi.nlm.nih.gov/Genbank/index.html
31
AustLi (Australasian Legal Information Institute) Public http://www.austlii.edu.au/austlii/
24
Digital Library Program (UVa) Public http://www.lva.lib.va.us/
21
Subtotal Public and Mixed Sources    
673,035
DBT Online Fee http://www.dbtonline.com/
30,500
Lexis-Nexis Fee http://www.lexis-nexis.com/lncc/
12,200
Dialog Fee http://www.dialog.com/
10,980
Genealogy - ancestry.com Fee http://www.ancestry.com/
6,500
ProQuest Direct (incl. Digital Vault) Fee http://www.umi.com
3,172
Dun & Bradstreet Fee http://www.dnb.com
3,113
Westlaw Fee http://www.westlaw.com/
2,684
Dow Jones News Retrieval Fee http://dowjones.wsj.com/p/main.html
2,684
infoUSA Fee/Public http://www.infousa.com/
1,584
Elsevier Press Fee http://www.elsevier.com
570
EBSCO Fee http://www.ebsco.com
481
Springer-Verlag Fee http://link.springer.de/
221
OVID Technologies Fee http://www.ovid.com
191
Investext Fee http://www.investext.com/
157
Blackwell Science Fee http://www.blackwell-science.com
146
GenServ Fee http://gs01.genserv.com/gs/bcc.htm
106
Academic Press IDEAL Fee http://www.idealibrary.com
104
Tradecompass Fee http://www.tradecompass.com/
61
INSPEC Fee http://www.iee.org.uk/publish/inspec/online/online.html
16
Subtotal Fee-Based Sources    
75.469
TOTAL    
748,504
Table 2: Sixty Largest Deep Web Sites