[1] The firm installed telephones in Tennessee, Kentucky, Mississippi, Louisiana, as well as Southern Illinois and Indiana.

[2] That same year, it merged with the Southern Bell Telephone and Telegraph Company, and Caldwell served as its President.

[4] Caldwell was a major shareholder of the Rodessa Oil and Land Co.[5] In 1937, he was ordered by the chancery court to surrender his stock to cover some of his son Rogers's debt to the State of Tennessee.

[5] Caldwell recommended John Trotwood Moore for State Librarian and Archivist of Tennessee to Governor Albert H. Roberts in 1919.

They resided at Longview, an antebellum mansion in Nashville, now owned by Lipscomb University.