Comparison of some dreyfusia (= adelges) infestations in eurasia and North America
Pschorn-Walcher, H.
Comparison of some dreyfusia (= adelges) infestations in eurasia and North America - Switzerland 1964 - 1-154 p. - Commonwealth institute of biological control. Technical Bulletin No. 4 .
Comparison of some dreyfusia (= adelges) infestations in eurasia and North America - Switzerland 1964 - 1-154 p. - Commonwealth institute of biological control. Technical Bulletin No. 4 .