/usr/share/acl2-8.0dfsg/books/nonstd/nsa/ is in acl2-books-source 8.0dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/alternating-series.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/chain-rule.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/complex-polar.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/continuity-product.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/continuity.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/derivative-raise.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/derivatives-composition.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/derivatives.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/equivalence-continuity.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/equivalence-derivatives-composition.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/equivalence-derivatives.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/equivalence-limits.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/exp-continuous.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/exp-sum.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/exp.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/factorial.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inner-sums.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/intervals.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverse-derivatives.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverse-monotone.acl2
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverse-monotone.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverse-square.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverse-trig.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/inverses.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/ln.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/next-integer.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/norm.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/nsa.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/overspill-proof.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/overspill-test.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/overspill.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/raise.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/sine.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/sqrt.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/trig-approx.lisp
/usr/share/acl2-8.0dfsg/books/nonstd/nsa/trig.lisp