A book that teaches about regional differences and communication mechanisms. - Title: Introduction to Dialectology - Authors: Masako Omori, Sachiko Tanaka, Mari Yoshida, Harumi Mimura - Contents: Regional differences in language seen from different regions, language structure, communication, regional differences in language seen from social changes, etc. - Appendix: Let's investigate Almost unused, but it is bent because it was stored folded. Thank you for looking.