/usr/lib/R/site-library/pwt/INDEX is in r-cran-pwt 7.1.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | pwt5.6 Penn World Table 5.6
pwt6.1 Penn World Table 6.1
pwt6.2 Penn World Table 6.2
pwt6.3 Penn World Table 6.3
pwt7.0 Penn World Table 7.0
pwt7.1 Penn World Table 7.1
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