An MS-DOS based package that describes the CWLS log data standard. The package includes a REFORMAT program (Version 2.41) to manipulate LAS files and a CERTIFY program (Version 3.5) to verify that the data set conforms to the LAS standard, etc. (see also The Log Analyst vol. 34, no. 2, March-April 1993, pp. 60-90).
FREE from http://www.canpic.ca/CWLS/softcwls.html