Locate the catalog number that is printed on the spine of the record sleeve. This is usually a letter/number combination that combines letters in the record label's name with the number of the release. For instance, Nirvana's "Bleach" album was released by the Sub Pop record label in 1989 with the catalog number, SP34b. However, many record labels in the '50s through the '70s did not use the letter/number format, primarily using digits in their own cataloging system instead.
Log onto the Internet and go to Discogs.com and in the upper right hand corner search box, type in the exact catalog number that appears on the spine of your record sleeve. Hit the search button and wait for the search engine to find a match for your catalog number.
Buy the current edition of Goldmine's Price Guide to Collectible Record Albums then look for the record you just looked up on Discogs.com to see if the catalog number matches the number listed in Goldmine's Price Guide. This serves as a method to double check your Internet search. Discogs.org has proved to be a reliable source but it just like many community generated databases, it will never be 100 percent flawless.