These are the traces described in the paper:
"Measurements of a Distributed File System,"
M. Baker, J. Hartman, M. Kupfer, K. Shirriff, and J. Ousterhout,
Proceedings of the 13th ACM Symposium of Operating Systems Principles,
October 1991, pp. 198-212.
John Hartman's useful documentation and sample program.
There are two collections of source files that contain a sample
program. I don't know what the difference between them is.