31. Reference : CY-1-19-11

Royal Institute of Finance - regulations for print books

| 1981 | Royal Institute of Finance - regulations for print books (1981) | Typescript

32. Reference : CY-1-19-12

Glossary letter ‘P’

| 1981 | Glossary letter ‘P’ | Typescript

33. Reference : CY-1-19-13

Historical Thai terms

| 1981 | Historical Thai terms | Typescript

34. Reference : CY-1-19-14

Contemporary historical terms

| 1981 | Contemporary historical terms | Typescript

35. Reference : CY-1-19-15

Political terms

| 1981 | Political terms | Typescript

36. Reference : CY-1-19-16

Historical terms of America, Africa, and Europe for glossary letter ‘A’

| 1981 | Historical terms of America, Africa, and Europe for glossary letter ‘A’ | Typescript

37. Reference : CY-1-19-17

Historical terms of Sikkim

| 1981 | Historical terms of Sikkim | Typescript

38. Reference : CY-1-19-18

Historical terms of East Asia

| 1981 | Historical terms of East Asia | Typescript

39. Reference : CY-1-19-19

Historical terms of Indonesia

| 1981 | Historical terms of Indonesia | Typescript

40. Reference : CY-1-16-1

Official note: Investigation of Ban Chiang antiquities

| 1981 | Official note: Investigation of Ban Chiang antiquities | Typescript