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Glen VYou can look for some of the cards on the Old Cardboard website - they have pictures of different issues with an estimated value (start looking under R cards - Goudeys?): http://www.oldcardboard.com/
Or, buy the Standard Catalog of Baseball Cards from your local books store or Amazon: http://www.amazon.com/exec/obidos/tg/detail/-/0873498798/qid=1102178071/sr=8-1/ref=sr_8_xs_ap_i1_xgl14/102-0251518-2914555?v=glance&s=books&n=507846