This Echelon bundle available here on GOG includes only the executable binaries package and the game manual for the MS-DOS edition (English) of the game.

The additional documentation that originally came with the game but is missing here is available on 'c64games.de', albeit in their *C64* incarnations!: https://www.c64games.de/phpseiten/spieledetail.php?filnummer=3989

"Manual" archive: echelon_anl.zip
- Echelon_(Access_Software)_(UK)_Manual.pdf
- Echelon_(Access_Software)_(US)_Manual.pdf
- Echelon_(Access_Software)_Keyboard_Overlay.gif
- Echelon_(Access_Software)_List_of_Tape_Counter_Readings.gif
- Echelon_(Access_Software)_Map.gif

"Lösung" archive: echelon_sol.zip
- Echelon_(Access_Software)_Map.bmp

Of course, the Lip Stik headset controller is not included. Haha!! <;b

-mwirkk