桂家文書之内福山健偉書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
桂家文書之内山之内貞奇書翰
Shimazu Collection - Historiographical Institute, The University of Tokyo
山之内貞奇奥秘稿
Shimazu Collection - Historiographical Institute, The University of Tokyo
新納久修書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
橋口彦次書翰（桂久武・同孫兵衛宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
関山金生書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
桂家文書之内町田久憲書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
吉永生一書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
奈良原繁書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
ボードイン書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
松浦竹四郎書翰
Shimazu Collection - Historiographical Institute, The University of Tokyo
葛城彦一書翰（有川七之助宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
野村盛秀書翰（汾陽光遠宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
松方正義・沖直次郎書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
大迫喜衛書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
小原正時書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
高木秀明書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
富山義直書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
肝付兼両書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
椎原国幹書翰（桂久武宛）
Shimazu Collection - Historiographical Institute, The University of Tokyo
