Findings:

• Comics Publishers and Publications (category)
• Researching Publishers
• Publisher's Clearinghouse
• The publisher is just the middleman
• Publishers Weekly
• First Publishers of the Truth
• Twayne Publishers
• Publisher/Subscriber pattern
• A Letter to William Heinemann (London publisher), September 23, 1905
• marketplace
• publisher
• Host Publisher
• Festival marketplaces
• I want to live in a world of a marketplace of ideas.
• Idols of the Marketplace
• Reconciling Perspectives on Media Policy: Transcending the Marketplace of Ideas
• Marketplace of ideas
• The Flies in the Market-place

If you Log in you could create a "Publisher's Marketplace" node. If you don't already have an account, you can register here.