come across a book in the card catalog that you think will be useful your research of famous labor leaders What three things should copy from so know how to find it?

Here are three things you should copy from a book in a card catalog to help you find it:

1. Author's Last Name and First Initial: This is the most important piece of information. It will allow you to find the book quickly within the catalog's alphabetical listing.

2. Title of the Book: Knowing the full title will help you differentiate the book from others by the same author. It will also be helpful if you want to search for the book online using a library catalog or bookselling website.

3. Call Number: This is a unique number assigned to each book in the library. It helps library staff and users find the book on the shelves. Write this down carefully, as the call number will guide you to the exact location of the book in the library.

Bonus Tip: If you're unsure if a book is relevant to your research, take note of the subject headings listed in the catalog entry. These can give you a quick overview of the book's content and help you decide if it's worth tracking down.