A sheet divider may include a sheet stock having an edge and a tab. The tab may be disposed at the edge of the sheet stock and have an opening. The opening is configured to enable a label to be inserted into the tab from a direction that is substantially perpendicular to the edge of the sheet stock. For example, a label may be inserted into the tab from a direction of the sheet stock. In other words, a label may be inserted in a direction that is substantially perpendicular to the edge of the sheet stock. The tab may include a projecting portion that extends beyond the edge of the sheet stock and that is free of openings. A pocket may be formed in the projecting portion to receive a label. In addition, the projecting portion may be curvilinear in shape. The labels may be relatively large so that a proximal portion extends out of the tab. The sheet stock may include retaining structure for retaining the corners of the proximal portion of the label against the sheet stock.