noun
documentary value; value as historical material
Refers to the worth of a document, record, or other material as a source of information, especially in historical or archival contexts.
この手紙は歴史的な資料価値が高い。
This letter has high value as a historical document.
古文書の資料価値を評価する。
Evaluate the documentary value of old manuscripts.
Compound of 資料 (しりょう, 'document, material') and 価値 (かち, 'value'). The spelling 史料価値 uses 史料 ('historical material') for the first part.