The work presents - as far as is now possible - the language spoken by Lutsk Karaims in the second half of the 19th and the first two decades of the 20th centuries. This is attempted by means of editing eleven private letters and five open letters written in Lutsk Karaim - with Hebrew interpolations. The letters were written by different authors in Hebrew script. The present publication appears to be the first critical edition of this type of texts written in this particular dialect. Previous editions of south-western Karaim manuscripts either concerned very short texts ftom Halych or were prepared with no intention of being professional.