• Public Domain Tarot Books (Benebell Wen) (benebellwen.com)
• The Pictorial Key to the Tarot (Gutenberg 11614) (www.gutenberg.org)
• The Tarot of the Bohemians (Gutenberg 4363) (www.gutenberg.org)
• Archive.org - Pictorial Key to the Tarot (Item page) (archive.org)