Here are several reputable technical and engineering drawing books available as PDFs. These resources range from beginner student textbooks to comprehensive professional manuals. Manual of Engineering Drawing
: A modern open-access ebook that covers principles and practical applications for today's engineering students. Textbook of Engineering Drawing (2nd Ed) technical drawing books pdf link
If you found this list useful, you may also want to search for "descriptive geometry pdf link" or "GD&T pocket guide pdf." Here are several reputable technical and engineering drawing