UNITED STATES AND MEXICAN BOUNDARY SURVEY. DEPARTMENT OP THE INTERIOR 





PART 



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BOTANY OF THE BOUNDARY. 



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INTRODUCTION. By C. C. Parry, M.D. 



BOTANY By John Torrey, M.D. 



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CACTACE.^ . By George Engelmann, M.D 



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WASHINGTON 



1859. 



