Hi Jeff, Enclosed on the CD-ROM are the files for the SP600 JX-17 and JX-21 receiver. The various sections are divided into subdirectories. The naming convention is as follows: Example: 1-2-6 The 1-2 indicates the section 1-2 and the -6 indicates six pages in the section. Within the subdirectory, the pages are numbered as: 1-2-cover, 1-2-A, 1-2-i, 1-2-1, etc. All of these pages are printed on the front side of the card. If there is any information to be printed on the reverse of the card it will be indicated as X-X-r. The files are scanned at 300 dpi and saved as .tif files. There was quite a bit of work involved in getting the card files to this state, so, permission is granted to include the files on your Hammarlund CD-ROM for the exclusive personal use of anyone who purchases the CD-ROM. ANY FURTHER DUPLICATION FOR ANY COMMERCIAL PURPOSE IS EXPRESSLY PROHIBITED! 73, Walt, W2OKF Colonel Walter S. Szachara, USAF (Retired) 8541 Bay View Drive Foley, AL 36535-9010