Using "c:version Libs/rtgmaster.library full" just gives the same as above.
Open all the files with a text editor and hopefully next to the version in the file, it should have a date (dd/mm/yyyy).
AMINET VERSION:
rtgmaster.library 14.0 11/12/1996
rtgami.library 1.84 23/04/1996
rtgegs.library 2.31 23/04/1996
rtgcgx.library 2.34 23/04/1996
rtgpica.library 1.0 25/01/1996
GENETIC SPECIES VERSION:
rtgmaster.library 37.0 12/05/1998
rtgami.library 38.0 13/05/1998
rtgegs.library 35.0 13/02/1998 (39.8 using "version")
rtgcgx.library 39.0 14/06/1998
rtgp96.library 39.0 09/06/1998
So it seems the version on Aminet is quite a long way out of date?