The value of stamps is determined by what people are willing to pay for them. Most of the time they want to see stamps in mint or near mint condition and also whether or not they are rare is important.
Yes, there are books to get and learn their values. It is better though to search for them on the internet since this is free.
Online sites that have stamp value guides include Stamp Collecting Resources, Stamps Site UK, Hobbizine, Find Your Stamps Value, Stamp Treasures and Mystic Stamp.
stamp collecting
Litho in stamp collecting refers to the printing process called offset lithography.
This is a very admirable hobby to get into as millions do in the US. You can get some ideas of value at values.hobbizine.com/stamps/index.html.
Burton Hobson has written: 'Coin identifier' -- subject(s): Coins 'Coin collecting as a hobby' -- subject(s): Coins, Collectors and collecting, Juvenile literature, Numismatics 'Stamp collecting as a hobby' -- subject(s): Stamp collecting 'Historic gold coins of the world: from Croesus to Elizabeth II' -- subject(s): Gold coins 'Illustrated encyclopedia of world coins' -- subject(s): Coins, Dictionaries, Encyclopedias 'Picture guide to coin conditions' -- subject(s): Numismatics 'Hidden values in coins' -- subject(s): Coins 'International guide to coin collecting' -- subject(s): Coins 'Stamp Collecting for Beginners' 'Getting started in stamp collecting' -- subject(s): Stamp collecting 'Coins and coin collecting' -- subject(s): Coins 'Catalogue of Scandinavian coins' -- subject(s): Scandinavian Coins
Kenneth F. Chapman has written: 'Good stamp collecting' -- subject(s): Collectors and collecting, Stamp collecting
Walter Young has written: 'Stamp collecting, A to Z' -- subject(s): Stamp collecting
Margaret I. Morris has written: 'Thematic stamp collecting' -- subject(s): Stamp collecting
because stamp were easily obtained .
Stamp collecting
Edward H. Spire has written: 'Adventures in stamp collecting' -- subject(s): Stamp collecting