The little yellow book

Certain types of books lose their title when they achieve wide use and notoriety and become known only by the color of the cover.

The probably most famous one does not have much of a title in the first place. We are talking about the "little black book" of course, which may or may not say "Contacts" on the cover. The little black book is iconic, and the 2004 movie of the same name has its own Wikipedia page.
The transition to the world of smart phones, rocky as it may be, has seen at least one app that took the name Little Black Book into the digital age, it is an app for brokers.

Then there is the Little Red Book of Chairman Mao fame. Chances are, you won't know many or even a single one of the man's quotations, but you are almost certain to know the name of the book. Well, make that almost certain if you are over 60.

There are the little yellow book, the little blue book, and many more.

And that's just a handful of English language versions. Drop the qualifier "little", extend your search to other languages, and you could spend a year just reading <name of a color> books.

The German veteran nuclear worker we quoted in the post "Chasing Isotopes" showed us his little yellow book used to record radiation exposure. The K-Landnews Random Research team looked around the interweb for a minute and did not find a picture, so we took one and stick here. Experts among you may notice this is a somewhat dated version.

photo (c) 2013 K-Landnews, under https://creativecommons.org/licenses/by-nc/3.0/deed.en_US