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You may also take a look at the source code.
The networks in this dataset can be loaded directly from graph-tool with:
import graph_tool.all as gt
g = gt.collection.ns["scotus_majority/2008"]
(and likewise for the other networks available.)

scotus_majority — SCOTUS majority opinions


Network of legal citations among majority opinions written by the Supreme Court of the United States (SCOTUS), from 1754-2002 (2008 version) and 1792-2006 (2007 version). In addition to the citation network, node metadata is included giving some description of each opinion.1

  1. Description obtained from the ICON project. 

Informational Legal Unweighted Metadata Temporal
Upstream URL [Errno -2] Name or service not known
Tip: click on the table header to sort the list. Hover your mouse over it to obtain a legend.
Name Nodes Edges $\left<k\right>$ $\sigma_k$ $\lambda_h$ $\tau$ $r$ $c$ $\oslash$ $S$ Kind Mode NPs EPs gt GraphML GML csv
2008 25,417 216,738 8.53 21.23 61.45 15.59 0.18 0.13 13 1.00 Directed Unipartite name usid parties overruled overruling oxford 1.0 MiB 1.7 MiB 1.6 MiB 1.5 MiB
2007 34,613 202,167 5.84 17.39 39.09 189.06 -0.04 0.08 12 0.99 Directed Unipartite lexid usid name amiciz_num auth_num oxford_num cq_num nyt_num insc_num apin_num stin_num citedyr_num citingyr_num size_num age insc_num_lag apin_num_lag stin_num_lag outsc_num_lag sc_cumul_cites_lag 1.5 MiB 2.2 MiB 2.2 MiB 2.1 MiB
2008 drawing
2007 drawing