Be My Valentine: Victorian Comic Valentines

A History of Valentines in the United States

Antiques and Collecting: Old-time valentines recall holiday's history

Down with Love: A Brief History of the Vinegar Valentine – Maryland Center for History and Culture

Victorian-era valentines sparked conflict, not kisses - The Daily Universe

Why Were Victorian Valentines Both Sweet and Sour?, Antiques, Collectibles & Historical Stories

Vinegar Valentines' Were Savage Victorian Valentine Cards

The Rude, Cruel, and Insulting 'Vinegar Valentines' of the Victorian Era - Atlas Obscura

Vintage VALENTINE Heart Thinking of You 5x6 #3211 Greeting Card Art 2pcs

Vinegar or Comic Valentine Titled Office Boy - Ruby Lane

Vinegar Valentines: The Sweet and Sour of Valentine's Day Cards, by Margo Lestz

Quirky Victorian valentines

My Heart Antique Valentines Day Postcard – SoaringHawk-Vintage

Vinegar Valentines' Were Savage Victorian Valentine Cards