Rubber-content of North American plants by Harvey M. Hall and Frances L. LongHarvey Monroe Hall · First published 1921Open the Tome
Studies in Ornamental Trees and Shrubs, Volume 4, Issue 5Harvey Monroe Hall · First published 2018Open the Tome
Significance of taxonomic units and their natural basis from the point of view of taxonomyHarvey Monroe Hall · First published 1929Open the Tome
The taxonomic treatment of units smaller than speciesHarvey Monroe Hall · First published 1929Open the Tome
