I did not look into the old messages (due to time restriction...); this may however senseful to solve the puzzle in order to know what Bob has triggert to write this.
May Bobs sentence mean something like:
Seeing the current interest in log(arithm)s and co(-)logarithms [i.e. logarithms of inverse numbers 1/x], it might be that some readers would be interested in a short (50k pdf) paper that I have written on lo(g?)logs and i(inverse?)lo(g)logs.
