The primary method for obtaining NetBSD/mac68k is by anonymous ftp. The best location for obtaining the 1.3 release of NetBSD/mac68k is probably from NetBSD.ORG or one of its mirrors:
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-1.3/mac68k/
A more or less complete list of ftp mirror sites is available via the WWW at:
http://www.netbsd.org/Sites/index.html
or by anonymous ftp in the file:
ftp://ftp.netbsd.org/pub/NetBSD/NetBSD-current/doc/MIRRORS
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