| Harvest migration from 19th-century Ireland | Johnson, J. H. | Article in Journal | | 1967 |
| Marriage and fertility in 19th-century Londonderry | Johnson, J. H. | Article in Journal | | 1958 |
| Rural population changes in 19th-century Londonderry | Johnson, J. H. | Article in Journal | | 1970 |
| The context of migration : the example of Ireland in the nineteenth century | Johnson, J. H. | Article in Journal | | 1991 |
| The political distinctiveness of Northern Ireland | Johnson, J. H. | Article in Journal | | 1962 |
| The population of Londonderry during the Great Irish Famine | Johnson, J. H. | Article in Journal | | 1958 |