I Have A Nolan Ryan Card And It From 1991 How Can I Check How Much Its Worth

Which Nolan Ryan card from 1991 is it? It looks like there are quite a few of them listed on the following site for various prices. Baseball Single Cards - Nolan Ryan Baseball Cards (http://www.adsportscardsetc.com/index.asp?PageAction=VIEWCATS&Category=144)

Also, you will find a number of online price guides that you can use if you will click on the following search. Baseball Card Price Guide - Google Search (http://www.google.com/search?hl=en&safe=off&q=Baseball+Card+Price+Guide)