Provider: Japan Science and Technology Agency Database: J-STAGE Content:text/plain; charset="utf-8" TY - JOUR TI - title_in_Japanese TI - subtitle_in_Japanese AU - author_in_Japanese JO - Bulletin of Forest Economics VL - 1975 IS - 87 SP - 31 EP - 42 PY - 1975 DO - 10.20818/jfea.1975.87_31 ER -