Ah, the "Special" list. It's special because only Ogres can have these items. If you look closely, the items in the special list are all also present in the other lists. The harpoon is in the "Guide" list, the other ones in the "normal" Ogre list. Mortar under missile, club and iron fist under hand-to-hand. The special items have an extra page because they are new to Mordheim and their rules are explained here for the first time. All the other items from the "Guide" and "normal" Ogre list can be found in the rulebook. You can equip Clubs and Iron Fists just like Cleavers for example, because they have the Availability: "common" rule. Harpoon and Mortar have "Special 10" or "Special 12" (next to the point costs), which makes them harder to optain. There are rules for special items and how to equip them in the rulebook.