This map shows the number of books published per state for the full collection of 1450 cookbooks. New York has the greatest number of books published, followed by Massachusetts, Illinois, Pennsylvania, and California. These numbers align with the growth of the book publishing industry in the United States. New York City, traditionally the publishing center of the United States, published the greatest number over time, followed by other publishing centers in Boston, Philadelphia, Chicago, San Francisco, and Los Angeles. The trend in the numbers also shows the history of westward expansion from 1800 to 1920, with the greatest total numbers in the East and much lower numbers in the West.
Dividing the collection into United States census regions shows that 61.1% of the titles were published in the Northeastern region, 24% were published in the Midwest, 8.8% in the West, and 6.1% in the Southeast.
The map was created by downloading the MARCXML catalog records for the collection from the HathiTrust Research Center. The records were converted using MarcEdit and then sorted and cleaned using OpenRefine. The records were then loaded into Tableau to create latitude and longitude data from state names and to make a filled map displaying the number of records per state.