Ryoji Nakaoka
- Division of City Planning Department of Developmental Engineering Kitami Institute of Technology. In: 土木学会論文集 (Doboku Gakkai rombunshū), v. 1986, n. 371 (Juli 1986). (1986):
- The Impact of Improvement of Shinkansen from Relative Time Distance. In: Historical Studies in Civil Engineering, v. 15 ( 1995). (1995):
- A Study of Objective Classification for Historical Study in Civil Engineering. In: Historical Studies in Civil Engineering, v. 13 ( 1993). (1993):
- A Historical Study on the Time-Distance Map of Hokkaido Island. In: Historical Studies in Civil Engineering, v. 12 ( 1992). (1992):
- Creation and Application of Chronological Tables for the History of Civil Engineering with Relational Database. In: Historical Studies in Civil Engineering, v. 10 ( 1990). (1990):
- Honor of Civil Engineers. In: Historical Studies in Civil Engineering, v. 11 ( 1991). (1991):