The characters from the comic have long been licensed for use on merchandise, the success of the comic strip helping to create a market for such items. In 1958, the Hungerford Plastics Corporation created a set of five vinyl dolls of the most famous characters (Charlie Brown, Snoopy, Lucy, Linus, and Schroeder); they expanded this line in 1961 to make the dolls slightly larger and included Sally and Pig-Pen. An early example of the characters appearing in promotional material was strips and illustrations drawn by Schulz for the 1955 instructional booklet for the Kodak Brownie camera, "The Brownie Book of Picture Taking". Another early campaign was on behalf of Ford Motor Company; magazine illustrations, brochure illustrations, and animated television spots featuring the characters were used to promote the Ford Falcon from January 1960 into 1964. Schulz credited the Ford campaign as the first time where licensing the characters earned "a lot of money". However, he expressed a dislike of illustrating the adverts, describing it as "hard work" and would have preferred to dedicate equivalent effort to drawing the Sunday format strips.