Final answer:
The question pertains to readers' survey conducted by the Library of Congress regarding influential books, referencing 'To Kill a Mockingbird' and its ranking amongst others.
Step-by-step explanation:
The question is seeking information about a survey conducted by the Library of Congress regarding the impact of certain books on readers' lives. To Kill a Mockingbird (TKAM) was the subject of focus and its ranking among other influential books is queried. However, as the specific year and the number one ranked book are missing from the incomplete statement, a precise historical account cannot be provided without additional context or information.