The center-back line is a line which runs from the mid-point of the back of the neck line, down to the floor.
Pattern Making Fundamentals: Seam Allowance - The Cutting Class
Module 1 Lesson 3, PDF, Seam (Sewing)
Pattern Markings and Symbols -🦦 Otter Patterns
Pattern Markings and Symbols - Otter Patterns
Handiworker - Radial-line layout of pattern for Round Taper Off Center (Round to Round Offset Transition-plan view circles inline) Hans Siebert, Layout Drafting & Pattern Making for Heat & Frost Insulators, 2000
A Complete Course in Dressmaking/Lesson 4/Pattern making - Wikisource, the free online library
Drafting and Making Female Basic Bodice Block - Textile Learner
Wild Ginger Software, Inc. Wiki Anatomy of the Sloper
Pattern (sewing) - Wikiwand
Sewing Measurements & Taking Measurements for Sewing
Bodice Block Pattern Making Lessons ~ The Sewing Workshop
Luna Loungewear Sew Along Day One - Love Notions Sewing Patterns
What is a basic block?, Basic Pattern Making