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For your trip, I recommend exploring some insightful guides and books to enrich your experience. "Lonely Planet Germany" is an excellent travel guide, offering detailed information about both Cologne and Düsseldorf. You might also enjoy "Rick Steves Germany," which provides practical advice and cultural insights. For a deeper understanding of Cologne, consider "Cologne: A Cultural Guide" by Dieter Brühl. For Düsseldorf, "Düsseldorf Travel Guide" by Wendy Travel is a handy resource. All of these guides will help you discover local attractions, dining spots, and hidden gems during your journey. Safe travels!