Literature with slide-projectors is rare, especially with Leitz-projectors. So you must look after old catalogues, instruction and brochures from Leitz/ Leica.

A good overview gives the Leica-Wiki (but mainly in German), see and scroll to the bottom of the side. A set of brochures you can download as pdf-file.

Highly recommended is the book: Albert Schnelle: "Vom Uleja bis zum Pradovit" (only in German) and a useful overview offers Denis Laney: ”Collectors guide”.