You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "The Haverhill Historical Society Historic District is located in what county?" whose answer is Essex County.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Haverhill Massachusetts county
Useful Output:

Doc 1: Haverhill, Essex County, Massachusetts, USA : Originally known as Pentucket, Haverhill was incorporated as a town in 1641, and became a city
Doc 2: A vintage map of Haverhill, Massachusetts from 1856. The map is in a light pink color with green, yellow, and blue accents.
Doc 3: Map of the town of Haverhill, Essex County, Mass. [Massachusetts?: Published by AB Jaques, 1851] Map. https://www.loc.gov/item/2004631170/.
Doc 4: Title. Map of the town of Haverhill, Essex County, Mass. Names. Walling, Henry Francis, 1825-1888. Jaques, A. B.. Created / Published. [Massachusetts?]
Doc 5: Map of the town of Haverhill, Essex County, Mass - Norman B. Leventhal Map & Education Center.