Registering in the biggest book. Cal. Exhibit, Agricultural Building. St. Louis. [sign above book reads, "PLEASE REGISTER Largest book ever made 2500 pages Contains 150,000 names Weighs 500 lbs. Cost $300. to make it. Made by OUT WEST PUB. CO. Los Angeles, Cal."]

Chicago citation style
Not Known. Registering in the biggest book. Cal. Exhibit, Agricultural Building. St. Louis. [sign above book reads, "PLEASE REGISTER Largest book ever made 2500 pages Contains 150,000 names Weighs 500 lbs. Cost $300. to make it. Made by OUT WEST PUB. CO. Los Angeles, Cal."]. 1904. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt2j49p60m. (Accessed December 12, 2018.)
APA citation style
Not Known, (1904) Registering in the biggest book. Cal. Exhibit, Agricultural Building. St. Louis. [sign above book reads, "PLEASE REGISTER Largest book ever made 2500 pages Contains 150,000 names Weighs 500 lbs. Cost $300. to make it. Made by OUT WEST PUB. CO. Los Angeles, Cal."]. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt2j49p60m
MLA citation style
Not Known. Retrieved from the Digital Public Library of America <http://ark.cdlib.org/ark:/13030/kt2j49p60m>.
Note: These citations are programmatically generated and may be incomplete.