An almanac ( :
Some reference sources you can use to find out the current population in New York City include the US Census Bureau, New York City Department of City Planning, and official government publications from the state of New York or the city itself. Additionally, reputable news outlets or research institutions may also provide this information.
try your local library
The index of a reference book is typically located at the end of the book, after the main content and possibly after the bibliography or other supplementary material.
The population at the 2000 census was 492. That is the most recent I could find.
You can find information about "quantum mechanics" in the reference page of a physics textbook or a book specifically dedicated to the topic of quantum mechanics.
It will show you where you can find certain stuff in the book.
A telephone book.
atlas
Any reference book or textbook will teach you something. It depends on what you want to learn!
You can find the Census 2010 results at the US Census Bureau website.
You can find information about the UK Census on the website of the Office for National Statistics. For the US Census you can find information at the United States Census Bureau website.
Blue Book of Gun Values, proofhouse.com