Professor Heng Praiwan (1885-1959) (referencing some parts from the book AC Heng Praiwan by Suwit Khanthawit and Asst. Prof. Ing-on Suphanwanit)
Professor Heng Praiwan (1885-1959) (referencing some parts from the book AC Heng Praiwan by Suwit Khanthawit and Asst. Prof. Ing-on Suphanwanit)