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![Effects of xylem sap flow on carbon dioxide efflux from stems of birch (Betula pendula Roth) [An article from: Flora]](http://ecx.images-amazon.com/images/I/51Q2495H5TL._SL75_.jpg)
![Birch Sap - Boiron Gemmotherapy [2 fl. oz.]](http://ecx.images-amazon.com/images/I/41gCRRqBAjL._SL75_.jpg){kind=small}
