Lee's "Red Hill Studio" is filled with piles of Japanese-language documents such as adventurers 'diaries, official aboriginal affairs files and land contracts, along with 1: 50,000-scale topographical maps of Taiwan's aboriginal areas based on surveys ordered by the aboriginal affairs office of the Japanese colonial Governor-General's office, and many books.
李瑞宗的朱崙工作室裡，堆滿了一落一落的各種日文探險日記、官方理蕃檔案、地契等相關文獻，還有台灣總督府理蕃本署測繪的「五萬分之一台灣蕃地地形圖」以及書籍。