TRXMAKE
     =======

        This program makes b+tree files from the tract index files

     for use in the SEEDIS area program.  The resultant output

     file, which has the extension *.trx, replaces the those files

     and has the advantage of speedier look-up in the AREA module.

     The trx file is keyed by state/county/tract/place/mcd and has

     as data the area name and population.



     The program resides in sy$seedis:[seedis.btree].  

     If the original tract files is modified the ndxmake program must 

     be run to re-make the trx file.



     After making the b+tree file, it may be looked at by executing 

         sy$seedis:[seedis.btree]bt_look.exe.