Rather than looking for stamps online (I assume StampWorld.com), loan copies of Scott Standard Stamp Catalogue from your local library. This will help you answer a lot of questions. There are usually 6 volumes. Vol 1 Countries A-B, Vol 2 C-F, Vol 3 G-I, Vol 4 J-O, Vol 5 P-S, Vol 6 S-Z. Sort your stamps by countries and get the volume you need from your local library. If your branch don't have it, they can request it from another branch.