The Eight Books on Medicine of Aurelius Cornelius Celsus (Adapted to the Hamiltonian System with Interlinear English Translation) [Hardcover] Spanish Worman is a comprehensive German

Worman is a comprehensive German language textbook that covers all aspects of German grammar

It is not a treatise on the language

The content is structured in a way that allows learners to gradually build up their comprehension and speaking skills without needing to consciously memorize rules or vocabulary lists

published first in Latin and German and later republished in many European languages

The English translation

The Eight Books on Medicine of Aurelius Cornelius Celsus (Adapted to the Hamiltonian System with Interlinear English Translation) [Hardcover] Spanish Worman is a comprehensive GermanTotal 417 pages with hardcover. The book can be previewed here. For more information about learning languages with the Interlinear method see the video below.