Treatise on a Very Narrow Aspect of Study
This page is the CodyCross answer for the clue below from Professions, Group 1538, Puzzle 3 (Technicians).
Question is: Treatise on a Very Narrow Aspect of Study
and the answer is: MONOGRAPH
Word Meaning:
MONOGRAPH — A scholarly book or a treatise on a single subject or a group of related subjects; especially, such a document that is written by one person.
Definitions from Wiktionary.