A Monograph of the Western Hemisphere Bumblebees (hymenoptera: apidae: bombinae) : III. The genus pyrobombus subgenus cullumanobombus
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| Format: | Kitap |
| Language: | Turkish<br />English |
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Ottowa;
The Entomological Society of Canada,
1973.
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Memoırs of the entomological socıety of Canada;
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