. Carnegie Institution of Washington publication. BURSABURSA-PASTORISAND BURSA HEEGERI BIOTYPES AND HYBRIDS BY GEORGE HARRISON SHULL. WASHINGTON, D. C. PUBLISHED BY THE CARNEGIE INSTITUTION OF WASHINGTON. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington

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