Title: 67 pī hǣng khwāmsongčham Samnak Samrūat dān Witsawakam læ Thō̜ranī Witthayā
Description: Compilation of articles on work and experiences in the field of engineering topographical and geotechnical survey; volume brought out celebrating 67th anniversary of the Office of Engineering Topographical and Geotechnical Survey, the Royal Irrigation Department, Thailand, and commemorating the office's 44 senior officials on their retirement.