Robert Lang:

The complete book of origami

https://archive.org/details/The_Complete_Book_of_Origami_Step-by_Step_Instructions_in_Over_1000_Diagrams_by_/mode/2up

Origami design secrets

https://www.pdfdrive.com/origami-design-secrets-d182883751.html

Origami Instects

https://idoc.pub/documents/robert-j-lang-origami-insects-vol-2pdf-d4775226om42

Twists, tilings and tessellations

https://www.pdfdrive.com/twists-tilings-and-tessellations-mathematical-methods-for-geometric-origami-e158254622.html

Origami Zoo

https://drive.google.com/file/d/1w7xYIa67DXD8fuAbM3HRMiGqE4NBm2uv/view?usp=sharing

Jun Maekawa:

Genuine origami

http://paper-life.ru/images/origami-book/genuine-origami/Genuine_Origami_-_Jun_Maekawa.pdf

Me encontré esta página. Aparenta tener buenos PDFs:

https://origami-art.us/books-origami