| Edition | As printed | Type | Chars | Location | vs. previous |
|---|
| 1st ed. (1771) | OPOSSUM | cross-reference | 34 | vol. 3, p. 416 | |
| 2nd ed. (1778–83) | OPOSSUM | cross-reference | 35 | vol. 7, p. 5476 | |
| 4th ed. (1810) | ① OPOSSUM | article | 59 | vol. 15, p. 171 | |
| 5th ed. (1815) | ② OPOSSUM | article | 59 | vol. 15, p. 171 | |
| 6th ed. (1823) | ③ OPOSSUM | article | 59 | vol. 15, p. 171 | |