Here is the mapping between the three different identifiers we've used over the course of the project.

The "feature id" is our oldest legacy identifier and is formatted like "batlas-MM-TT-RR" where MM is the map number, TT is the table number within the map directory, and RR is the row number within the table.

The "batlas id" is formed by normalizing to ASCII the map labels and concatenating "-MM-GG" where MM is the map number and GG is the grid cell in lower case.

The "pleiades id" is a string unique to the container at http://pleiades.stoa.org/places and when concatenated to that URL produces the permanent URIs of objects in the Pleiades system (like '148107' -> 'http://pleiades.stoa.org/places/148107').

The first 5 lines of the attached file look like this:

FEATURE_ID,BATLAS_ID,PLEIADES_ID
batlas-1-2-12,aegyptus-1-j4,766
batlas-1-2-18,aethusa-ins-1-f3,772
batlas-1-2-21,africa-1-e4,775
batlas-1-2-22,africum-mare-1-d3-f3,776