Rāingān kānsưksā wičhai kīeokap "ʻāsāsamak wāngphǣn khrō̜pkhrūa" radap mūbān na ʻAmphœ̄ Phōthō̜ng Čhangwat ʻĀngthō̜ng phō̜.sō̜. 2518-2520 = Report on a pilot study of "Village volunteers in family planning" at Po Thong district, Angthong Province, Thailand 1975-1977