 Why did Miss Casey give the narrator the piece of paper?
Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] I came alongside and carefully started to lever the old man loose, one finger at a time. The clerk's hand fell on the coin and slid it off into the unknown before I could move, what with holding up Doc. I was bent double, but I got from the floor to the chair and found my notebook and orb-point in my hands. Somehow, inside me, I knew that these words were what I had been waiting for. I surrounded it like an ameba, almost in a single movement of my jaws. "It's Miss Casey—Vivian Casey," she corrected. No other girl would introduce herself as Miss Last Name.
 It was a ploy to learn more about Doc and what he had developed, so she had more evidence
 It was an accident, she had swapped it with the scrap of paper she meant to give the narrator  She wanted to pass the order along to Doc, the only person who could find the book  It was a ploy to learn more about Doc and what he had developed, so she had more evidence  She thought the narrator owed her for her buying him coffee and food, and he could repay her by finding the book