Meesang, W. and Navakakam, N. 2022. TYPE AND QUANTITY OF BACTERIA IN AIR FROM THE MAIN SERVICE ACTIVITIES IN THE OFFICE, CASE STUDY: FACULTY OF SCIENCE’S OFFICE UDON THANI RAJAHAT UNIVERSITY, SAM PHRAO CAMPUS. Research Journal Phranakhon Rajabhat : Science and Technology. 17, 1 (Jun. 2022), 1–9.