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UNITED STATES NATIONAL MUSEUM 



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CONTRIBUTIONS 



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United 



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National 



Herbarium 



Volume 



SYSTEMATIC INVESTIGATIONS IN PHANEROGAMS 



FERNS, AND DIATOMS 





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NORTH AMERICAN SPECIES OF FESTUCA; GENUS PTELEA IN THE 

 WESTERN AND SOUTHWESTERN UNITED STATES AND MEXICO; 

 MEXICAN AND CENTRAL AMERICAN PLANTS; LEGUMINOSAE 

 OF PORTO RICO; DIATOMS OF THE ALBATROSS VOYAGES; 

 CYPERACEAE OF COSTA RICA; TROPICAL AMERICAN FERNS 





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GOVERNMENT PRINTING OFFICE 



1906-1908 



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