książka kodów

"And did these orders state that the code books were to be allowed to fall into the hands of the Germans?"

I saw him checking in a code book, to find out what they meant.

I'll check my code book and get back to you.

Her story, that she had stolen the code book, was a lie.

Not that they are going to toss out the code book.

Let me see, where did I put that code book?

He found the code book and slipped it into his pocket.

And he had access to the code books, too.

To prove it, she decided to use the code book.

When asked the price, the assistant looks in the code book and sees another figure.