本研究應用書目計量方法對臺大圖書館特藏資源《田中文庫》的價值與貢獻，提供歷史書目的描述與引用文獻分析的支持。除了回顧臺大圖書館建置《田中文庫》的歷史文件外，本研究分析可獲得之204筆田中長三郎著作與792筆引用文獻，由田中長三郎的引用動機與目的，瞭解特藏資源對柑橘分類學研究的具體助益與重要性。本研究為極少數以書目計量方法對圖書館特藏資源進行引文與內容分析之實證研究，同時相較過去植物分類學領域以單一領域或單一學術期刊為主之書目計量研究，本研究為具有多元形式之圖書館特藏資源的引用行為提出具體的描述與說明，並根據研究結果對圖書館特藏資源之管理、內容與服務提出具體建議及參考。

Based on the representative attributes built around specific subjects or uniqueness in publishing forms, special collections are often viewed as important asset of research libraries. However, previous studies have pointed out the common issues of hidden collections and backlogs in many special collections due to the unfamiliarity of the collections. This bibliometric study adopts the research methods of document analysis and citation analysis to investigate NTU Tanaka Collection, a special collection about botanical literature housed by National Taiwan University Library. 204 of the plant taxonomist Tanaka Tyozaburo’s publications and the 792 citations he used are selected for citation analysis with reference to the history of taxonomic botany. The results of the study suggest NTU Tanaka Collection possesses significant and important references to taxonomic botanists in general, and to Tanaka’s research on the identification and phylogeny of citrus fruits in specific. According to the findings, this study provides a historical bibliography and a reference network of NTU Tanaka Collection. This study is one of the very few empirical studies that adopted bibliometric analyses in library special collection, and it also provides rather thorough and objective evidence of scholarly usage of special collections. The findings of the study contribute to the research and practices of special collection curation and outreach.