/etc/crosshurd/sources.list/gnu is in crosshurd 1.7.51.
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 7 8 9 10 | # See sources.list(5) for more information, especialy
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.
deb http://ftp.debian-ports.org/debian unreleased main
deb http://httpredir.debian.org/debian unstable main
# Uncomment if you want the apt-get source function to work
#deb-src http://httpredir.debian.org/debian unstable main
#deb-src http://ftp.debian-ports.org/debian unreleased main
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