Acknowledged author wrote Graphics Standard Manual: New York City Transit Authority comprising 356 pages back in 2015. Textbook and etextbook are published under ISBN 0692496955 and 9780692496954. Since then Graphics Standard Manual: New York City Transit Authority textbook was available to sell back to BooksRun online for the top buyback price or rent at the marketplace.
The NYCTA Graphics Standards Manual contains scans of Massimo Vignelli and Bob Noorda's (Unimark) modernist masterpiece. The manual describes the design and construction for the iconic NYC subway signs that we still see and use.