The museum collection contains hundred of photos and glass negatives detailing working life at Liebig's. Liebig's company worked with popular cookery writers in various countries to popularize their products. German cookery writer Henriette Davidis wrote recipes for "Improved and Economic Cookery" and other cookbooks. Katharina Prato wrote an Austria-Hungarian recipe book, "Die Praktische Verwerthung Kochrecepte" (1879). Hannah M. Young was commissioned in England to write a cookbook for the Liebig Company. Her popular cookbook, "The Liebig Company's Practical Cookery Book", was published in 1893. In the United States, Maria Parloa extolled the benefits of Liebig's extract. Colorful calendars and trading cards were also marketed to popularize the product. Liebig produced many illustrated advertising products: table cards, menu cards, children's games, free trading card sets, calendars, posters, poster stamps, paper and other toys. In 1872, they began to include sets of trading cards featuring stories, historical tidbits, geographic tidbits, and so on. Many famous artists were contacted to design those series of cards, which were first produced using true lithography, then litho chromo, chromolithography, and finally offset printing. The cards remain popular with collectors and are often collected in albums. A set usually consisted of six cards, grouped around a particular theme. This example set includes chemists both ancient and modern. One card features Liebig and his laboratory of students.