This series consists of both commercial and handmade valentines, given and received by Olive Percival. It also includes collector type valentines, both framed and unframed. Handmade valentines by Olive Percival with no addressees, and valentines given by Olive Percival to her cats and dolls are also found in this series. Newspaper and magazine articles about valentines, as well as correspondence regarding valentines, are included in this series.

This series is arranged by the purpose or recipient of the valentines, beginning with those Olive Percival gave to her cats and dolls, followed by valentines made by Olive Percival apparently not given away, valentines given by Olive Percival to family members, valentines received by Olive Percival, those collected by Olive Percival (primarily historical and unusual valentines), and framed valentines. Related material, including articles and correspondence, follows last in the series arrangement.