[3] British Army officers in the Dorchester area were impressed with Holbrook's desire for learning, and instructed him in surveying, map making, and engineering.
In 1811, Holbrook sold his businesses and relocated to Warehouse Point, Connecticut; he returned to Brattleboro after the death of his son-in-law William Fessenden, the husband of his daughter Patty.
[1] A devoted member of Brattleboro's East Village Congregational Church, in 1816 Holbrook was appointed a deacon, and was frequently addressed by that title afterwards.
The Holbrook Bibles were noted for their extensive illustrations and high quality paper, which made the type easier to read.
He was an original board of trustees member for both Brattleboro's first high school and the Vermont Asylum for the Insane.