@misc{indiciaeca7c64bd8937,
  title = {Change of materials and construction of forts. Letter from the Secretary of War, in answer to a resolution of the House of April 15, in relation to the changes which may have become necessary in materials and construction of forts, \&c. May 19, 1862. -- Referred to the Committee on Military Affairs, and ordered to be printed},
  author = {united states. congress. house and united states congress. house and united states. war department. engineer department and united states. government publishing office and united states. war department},
  year = {1862},
  url = {https://www.loc.gov/item/2024799083/},
  note = {Source identifier: 2024799083}
}