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ZEISS DTI thermal imaging cameras. For more discoveries at night, and during the day.

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  1. S

    Sibley vs. Sibley and Sibley

    Opinions needed. I'm going to buy book/books that cover the whole N.America. I have three to choose (actually two options): a) Sibley (2000): North American Bird Guide 544 pages B)Sibley (2003): Field Guide to the Birds of Eastern North America + Sibley (2003): Field Guide to the Birds of...
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