The file you are now reading is 9903INDX.TXT. It lists and describes each file in this directory. The file 99MJCCOL.BAS contains the source code published in the May/Jun 1999 Computer Column of _The Cryptogram_. This is a bare-bones interactive solver for standard-alphabet periodics. See the printed article for details. The file 99ISSU03.ZIP contains the files in this directory. The .ZIP was created under MS-DOS and the text files are in DOS ascii text format.