| Authors(s) | Walstad, J.D. |
| Year | 1972 |
| Title | Impact of the Pine needle scale, Phenacaspis pinifoliae (Fitch), on the physiology of Scots Pine, Pinus sylvestris. Dissertation Abstracts International, B 32: 5852. |
| Authors(s) | Walstad, J.D. |
| Year | 1972 |
| Title | Impact of the Pine needle scale, Phenacaspis pinifoliae (Fitch), on the physiology of Scots Pine, Pinus sylvestris. Dissertation Abstracts International, B 32: 5852. |