These are from saildart.org and include various SAIL file data.

 361488 Jan 11  1988 ./jjw/tex/bibtex.web	0.99a
 362700 Jul 31  1988 ./sys/tex/bibtex.web	0.99b
 278112 Jan 24  1986 ./sys/tex/bibtex.web.~1~	0.98i
 278952 Feb  6  1986 ./sys/tex/bibtex.web.~2~	0.98i2