There are no other files named galv50.b13 in the archive.
Edit 430 to MOUNTR.MAC will not unload a tape if a 2400' tape is at physical
EOT and the tape drive is not a TU72. If the rewind operation takes more
than one minute the rewind operation will timeout and the tape will be left
at BOT. This problem will be fixed ASAP, meanwhile the tape will have to be
unloaded with the OPR DISMOUNT TAPE command or physcially unload the tape.